J-PARC Annual Report 2017
Contents
Preface …………………………………………………………………………………………………………… 1
Accelerators ……………………………………………………………………………………………………… 3
Overview of the Accelerator………………………………………………………………………………… 3
Linac……………………………………………………………………………………………………… 6

RCS ………………………………………………………………………………………………………… 9
MR ……………………………………………………………………………………………………… 12
Materials and Life Science Experimental Facility ……………………………………………………………… 15
Overview ………………………………………………………………………………………………… 15
Neutron Source ………………………………………………………………………………………… 16
Neutron Science ………………………………………………………………………………………… 17
Neutron Device ………………………………………………………………………………………… 18
Muon Source and Science ……………………………………………………………………………… 19
Technology Development ……………………………………………………………………………… 21
Particle and Nuclear Physics …………………………………………………………………………………… 23
J-PARC Neutrino Experimental Facility………………………………………………………………… 23

J-PARC Hadron Experimental Facility …………………………………………………………………… 24
Strangeness / Hadron Physics Experiments…………………………………………………………… 24

Kaon Decay Experiment ………………………………………………………………………………… 25
J-PARC Muon Experiments ……………………………………………………………………………… 25
Highlights-1: Enhanced early hint of CP asymmetry in the neutrino sector ……………………………… 26
Highlights-2: The first determination of level structure of 19ΛF and a radial dependence ofΛN spin-spin interaction strength ………………………………………………………… 28
Highlights-3: Beam innovation strengthens the J-PARC particle and nuclear physics program ………… 30
Cryogenics Section…………………………………………………………………………………………… 33

Overview ………………………………………………………………………………………………… 33
Cryogen Supply and Technical Support ………………………………………………………………… 34
Superconducting Magnet System for T2K ……………………………………………………………… 34
Superconducting Magnet Systems at the MLF ………………………………………………………… 35
Superconducting Magnet Systems at the HEF………………………………………………………… 35

R&D for the Future Projects at J-PARC …………………………………………………………………… 36
Information System …………………………………………………………………………………………… 37
Overview ………………………………………………………………………………………………… 37
Status of Networking …………………………………………………………………………………… 37
Internet Connection Services for Visitors and Public Users of J-PARC …………………………………… 39
Status of Computing …………………………………………………………………………………… 40

Transmutation Studies ………………………………………………………………………………………… 43
Overview ………………………………………………………………………………………………… 43
Research and development…………………………………………………………………………… 45

International collaboration ……………………………………………………………………………… 48
Safety …………………………………………………………………………………………………………… 49
Safety …………………………………………………………………………………………………… 50
User Service …………………………………………………………………………………………………… 53
Users Office (UO) ………………………………………………………………………………………… 54
User Statistics …………………………………………………………………………………………… 56
MLF Proposals Summary - FY2017 ……………………………………………………………………… 57
J-PARC PAC Approval Summary after the 25th Meeting ………………………………………………… 58
Organization and Committees ………………………………………………………………………………… 61
Organization Structure …………………………………………………………………………………… 62
Members of the Committees Organized for J-PARC ……………………………………………………… 63
Main Parameters……………………………………………………………………………………………… 69

Events …………………………………………………………………………………………………………… 71
Events …………………………………………………………………………………………………… 71
Publications …………………………………………………………………………………………………… 79
Publications in Periodical Journals ……………………………………………………………………… 80
Conference Reports and Books ………………………………………………………………………… 84
KEK Reports ……………………………………………………………………………………………… 91
Others …………………………………………………………………………………………………… 92
JAEA Reports …………………………………………………………………………………………… 92

J-PARC Annual Report 2017

Preface1

PrefaceThis volume describes the progress made at J-PARC in fiscal year 2017, from April
2017 through March 2018. During that period, we focused on maintaining the stable
operation of the Material and Life Sciences Experimental Facility (MLF) and gradually
increasing the beam power at the Main Ring (MR) to maximize the user beam availability
and the possible number of protons on target at each facility. We believe that a stable
and reliable operation of the facilities is the basis of the scientific achievements and we
promote it strongly in cooperation with the users from all over the world.
At the MLF, we started the operation at beam power of 150 kW, which was acontinuation of the lower power operation from the previous year, in order to avoid
damage to the vessel for the neutron production target. After a new target vessel was
installed, we were able to increase the beam power gradually to 400 kW by the end of
FY2017. As a result of the step-by-step approach to increasing the beam power while
maintaining the high level of availability, which has reached 93.3%, we were able toachieve simultaneously high stability and the world’s highest number of neutrons andmuons per pulse.
As of the operation of MR, the Fast eXtraction (FX) for the neutrino program has

Preface

J-PARC Annual Report 20172

reached a beam power of 475 kW, which is 63% of the design power, to produce impactful
results from the neutrino oscillation experiment, T2K. The Slow eXtraction (SX) had tostop its operation for a month due to the failure of the electro-static septum, which isthe crucial device of the SX. This incident limited the beam availability to 66%, However,the beam power was kept stably at the highest power of 50 kW in the operation fromJanuary to February 2018.
These beam operations have been realized on the basis of the safety policy adopted
at J-PARC, which is being continuously improved through the annual all-hands meetingfor safety, emergency drills, and safety review. The efforts to improve the safety not
only for the staff members but also for users and contractors working at the facilities,
especially newcomers, are continuing. One of those efforts is reflected in our slogan,“Mindful of Others”.
Other supporting sections, like the Cryogenics section and the Information systems
section, are also making progress to accommodate new users and new needs.
Due to the efforts to maintain the facilities with high availability and high beam
power, we were able to produce significant scientific and technological output. Someof it resulted in press releases with collaborating institutions. We would like to share
all these outcomes widely with the world community. Furthermore, we would like tocontribute to the society by enhancing the collaboration with universities, research
institutions, and industries not only by producing and sharing our results, but also by
creating the next generation of researchers with an extensive experience in cuttingedge facility operation, who can, in turn, produce the next generation of research facility
for the future.
“High power beams for the next stage of our life!”

Naohito SAITO
On behalf of the J-PARC staff members,
Director of J-PARC CenterAccelerators

Overview of the Accelerator
The J-PARC accelerator complex consists of a
400 MeV linac, a 3 GeV Rapid Cycling Synchrotron (RCS)
and a Main Ring Synchrotron (MR, 30 GeV). A proton
beam from the RCS is injected to the Materials and Life
Science Experimental Facility (MLF) for neutron andmuon experiments. The MR has two beam extraction

modes: fast extraction (FX) for the Neutrino experimental facility (NU) and slow extraction (SX) for the Hadronexperimental facility (HD).
The operation in FY2017 is illustrated in Fig. 1. The
topics related to the beam operation are as follows:

Fig. 1. Accelerator operation in FY2017.

Accelerators

J-PARC Annual Report 2017

4(1) Operation for the MLF
Due to damages of the neutron production targets
incurred twice in 2016, we delivered beam at the lowerrisk power of 150 kW before the target replacement.
The target was replaced with a newly-designed one
during the summer shutdown of 2017. After a few daysof pilot operation at 150 kW, we increased the power to
300 kW in October and until December, smooth delivery was ensured at that power level. The beam power
was further increased to 400 kW in January 2018 andthe beam delivery continued without serious troubles.
To improve the quality of the experiments evenat the lower beam power, the linac and the RCS haveprovided a one-bunch beam instead of the regular twobunches, which created a shorter pulse, preferred bysome fast-TOF and muon users.
(2) Operation for the Neutrino Experiments (FX mode)
The user run of the MR-FX was continued fromFebruary of the previous fiscal year to April 12 at beam
power of 460-470 kW, which was slightly increased in
the operation from January 2017.
After the summer shutdown, we resumed beam
delivery in October and the beam power was increased
to 450 kW as the vacuum pressure improved after the
maintenance work on the MR. After the fine tuning of
the MR, we delivered beam at 470 kW, which was at asimilar level as before the summer shutdown.
The FX operation restarted in March at beam powerof 470 kW.
(3) Operation for the Hadron Experiments (SX mode)
We switched the extraction mode from FX to SX
on April 12 and smoothly ramped up the power to
44 kW, which exceeded the previous power of 42 kW in
June 2016. But during the startup after the scheduled
maintenance day of April 26, one of the Electro-Static
Septum (ESS) failed, and the beam operation was suspended. We coped with this issue for about three weeks
and delivered beam again, though the beam power
was slightly down to 37 kW. The details are described in
the MR chapter that follows.
The second SX operation run in the year was fromJanuary to February. Thanks to the beam tuning and thefaster repletion time, the beam power was increased to
50 kW, which was a long-desired power level. The otherhighlight in this run was a successful slow extraction

and delivery test at 8 GeV for the COMET (COherent
Muon to Electron Transition) experiment.
The operation statistics for FY2017 are shown in
Table 1 and Fig. 2. The total operation time, which wasshift leaders’ on duty time at the control room, including startup and RF conditioning, was 6,448 hours. The
net user operation hours and the beam availability rate
for each experimental facility were as follows: 4,249
hours (93%) for MLF; 1,757 hours (89%) for NU; and1,055 hours (66%) for HD. These statistics show that the
linac and the RCS operated properly. The cause of the
low availability for the HD was the ESS trouble in April
2017.
The downtime by components is shown in Fig. 3.
There were several causes of the downtimes.
Over the last few years, we have taken many countermeasures against troubles at the linac: stabilizationof the cooling water flow, inside cleaning of some
SDTL cavities, replacement of old bias power supplies
for HVDC. The result was an improvement of the availability compared to 2016. But the category of “HVDC”,
which is not limited to the Power Supply breakdown,
was still dominant. We had a 15-hour beam stop due toan insulation break of a high voltage cable to a klystron.
The next dominant category is “Others”. It includes cooling water pump failures, as well as some circuit breaks,
such as a reference signal generator, timing modules
and network modules.
We had a long downtime at the RCS in April 2016
due to a vacuum leak at one of the ring collimators. We
took countermeasures against this problem. The RCS
was rather stable in 2017.
The MR had several troubles in 2016, but thanks
to our persistent efforts, the reliability improved. One
exception was the ESS malfunction in the “SlowExt”
category. To rectify this problem, we considered several countermeasures to avoid the instability, as well as
actions to improve the hardware.
Most of the improvement and upgrade work
was carried out during the summer shutdown. These
improved items, major downtime causes, and beam
power history are described in further chapters.

J-PARC Annual Report 2017

Accelerators

5
Table 1. Operation statistics in hours for FY2017. Figures in the parentheses
in trouble columns show the loss time contributions as percentage.
Facility

User Time(hours)Trouble, Acc.only(hours)Trouble, Fac.only(hours)Net Time(hours)Availability, Toral
(%)

MLF

4,555

270 (5.9%)

35 (0.8%)

4,249

93.3

Neutrino
(FX)

1,978

185 (9.4%)

35 (1.8%)

1,757

88.8

Hadron(SX)

1,601

506 (31.6%)

39 (2.4%)

1,055

65.9

Srartup,etc. (1), 645
Trouble (Exp), 35
Trouble (Acc), 270

Srartup, etc. (2),666

LINAC/RCS Tuning,
Study, 910
LINAC/RCS
Tuning, Study, 853 3NBT/MLF Tuning,
Study, 336
Trouble,3NBT/MLF
57
Tuning, Study, 329
Trouble, 7

LINAC/RCS
Tuning, Study,853
Trouble (Exp), 39

HD users,
1055

Trouble (Exp), 35
Trouble (Acc), 185

350BT/MR/FX/SX
Tuning, Study,
1291

Trouble,57

Trouble (Acc), 506
HD users (Tot)1601

MLF users,
4249

LINAC/RCS Tuning,
Study, 910

350BT/MR/FX/SX
Tuning, Study, 1114

NU users,
1757

Trouble, 176

NU users (Tot),
1978

MLF users (Tot),
4555

Fig. 2. Operation statistics for FY2017. The total operation time was 6,448 hours.

72(558h)

60
48
36
24
0

BLM
RFQ
MEBT1
DTL
SDTL
DBNCH_old
MEBT2
ACS
DBNCH
HVDC
IonSource
MagnetVAC
Others
BLM
KMPS
BM
QM
SM
ST
Bump
Sep
RF
OthersBLM
Others
BLM
QM
SM
BM
ST
RF
Injction
SlowExt
FastExt
OthersMLF
HadronNeutrino
Earthquake
PowerOutage
others12_LINAC__RCS__3NBT_

Fig. 3. Downtime by components in FY2017.

_MR_

_EXP_

_Others_

Accelerators

J-PARC Annual Report 2017

6

Linac
H-Beam Current [mA]

80
70
60

RUN#73&74 RUN#75

RUN#76&77

RUN#78

50
40
30
20
10

1Ap
r-1
7
1M
ay
-1
7
1Ju
n17
1Ju
l-1
7
1Au
g17
1Se
p17
1O
ct
-1
7
1N
ov
-1
7
1D
ec
-1
7
1Ja
n18
1Fe
b18
1M
ar
-1
8
1Ap
r-1
8

0

Date

Fig. 4. Operation history of the ion source in FY2017.

Overview
During FY2017, the linac was operated with highavailability of about 93%. Two 10-hour long beam stop
events occurred due to the failure of a pump of a cooling water system and an anode modulator of a klystronhigh voltage power supply system. The number of trips
due to the RFQ and the beam loss monitor was still significantly higher than that of other components.
Accelerator components status
The linac has been operated with a peak beam
current of 40 mA for the user operation. A cesiatedRF-driven negative hydrogen ion source has been successfully providing the required beam without any
serious troubles. The operation history of the ion source
in FY2017 is shown in Fig. 4. We gradually increased
the continuous operation times of the ion source. In
RUN#78, a continuous operation of 2,080 hours wasachieved with the typical beam current, pulse lengthand repetition rate of 47 mA, 300 μs and 25 Hz, respectively. At the end of RUN#75 and RUN#76&77, the ion
source extracted a stable 68 mA beam to perform thehigh intensity beam study at the linac.
As shown in Fig. 5, we observed the RFQ RF-trip
approximately 15 times per day, which did not change
significantly in the past several years. These trip events
reduce the beam availability by approximately 1%. We
suppose the origin of the trip is the sparking between
vane tips, which had been contaminated by carbonrelated contaminants. Improvement of the vacuum

evacuation performance is planned to clean up the
inner surface of the RFQ.

Fig. 5. Time variation of the number of RFQ RF-trips.

After the earthquake in 2011, we could not input
a design rf power into some SDTL cavities due to themultipactor. To improve this situation, we polished theinside of the cavities by using acetone during the 2015
and 2016 summer maintenance. Owing to the treatment, the multipactor region disappeared perfectly
except for the SDTL05A cavity. Therefore, we retried
the polishing of the SDTL05A cavity in the summer of
2017. After the cleaning, the region almost disappeared
so it became possible to operate all the SDTL cavities
at design input rf power. However, recent observation
showed that the region started to expand slightly. We

J-PARC Annual Report 2017

Accelerators

7
need to continue to monitor it carefully.
The operation of the ACS cavities was more stable
than the one of the other cavities. The number of tripsof all the ACS cavities was about 0.3 times per day orless than one-third of that at the initial operation periodof the ACS.
The RF chopper system, which is installed just after
the RFQ, consists of two RF-deflecting cavities and abeam scraper. Recently, the 300-400 kW user operation with single-bunch was conducted at the RCS. In
the 400 kW and single-bunch operation, the scraper
received the heat flux approximately 1.3 times larger
than that at the 1 MW double-bunch operation (thisis our goal). The measured surface temperature of thescraper as the function of the operation time is shownin Fig. 6. At 400 kW and a single-bunch operation, thetemperature reached and saturated at about 1800°C.
The temperature is sufficiently lower than the tolerable level of 2900°C, where the gasification of carbon
becomes significant. As a result, it was confirmed thatthe present scraper was usable in the 1-MW operation
without problem.

section. Two BSMs were already installed at ACS#1
and #2 in 2016 and 2017. The last BSM for ACS#3 wasalready fabricated and is under testing at the vacuum
and RF system. We will install it in 2018.
A new wire scanner monitor (WSM) based on carbon nanotube (CNT) wire was developed. The CNT
device is expected to increase the wire’s lifetime. The
result of the off-line beam test showed the CNT-WSM
has the same dynamic range as the carbon-WSM, which
is presently used at the MEBT1 section (see Fig. 7). We
will install the CNT-WSM at the most upstream of the
MEBT1 section in 2018.

Fig. 7. Beam profile by CNT and carbon wire.

Fig. 6. Time variation of the temperature on the scraper surface.

Klystron system status
We replaced four 324-MHz klystrons and two 972MHz ones due to their performance degradation in
FY2017. Eleven 324-MHz klystrons exceeded 55,000
hours of operation as of March, 2018. These aged klystrons may come to the end of their life in the near future.
A klystron test-stand was built to perform off-line conditioning before installation to save replacement time.
Beam monitor development
In order to conduct more precise beam studies bymeasuring a longitudinal beam profile, we planned to
install three bunch shape monitors (BSMs) at the ACS

In preparation for higher intensity beam measurement we have been developing a gas-sheet beam
monitor for a non-destructive beam profile measurement. After the confirmation test, the monitor was
installed at the L3BT section during the 2017 summer maintenance. We could observe the beam profile
clearly at the preliminary experiment. We will continue
to develop the monitor for practical use.
60-mA trial beam study
We are considering further upgrade plan to increase
the RCS beam power to 1.5 MW. To realize the upgradeplan, the beam current and the beam pulse length must
increase to 60 mA and 600 μs respectively, which corresponds to an increase by 20% over the present design
values. The trial beam study with 60 mA current was
conducted in July and December 2017 to clarify theissues in realizing the upgrade plan. The first 400-MeV
and 56-mA beam at the linac exit was demonstrated in
December 2017, as shown in Fig. 8. We were concernedAccelerators

J-PARC Annual Report 20178that a significant beam loss could occur at the DTL1 section, because the alignment of the drift-tubes (DTs) in
DTL1 was deformed by the huge earthquake in 2011
so that the actual aperture was reduced. However, nosignificant beam loss was observed during the beam
study. Therefore, the shift of the DT alignment is probably not fatal to the 60-mA operation.
A significant decrease of the beam transmission
was observed in the RFQ and the MEBT1 scraper. The

RFQ transmission was about 6% lower than that of thenominal 40 mA. In order to improve the beam transmission, we plan to increase the RFQ tank level, re-optimize
the MEBT1 lattice and adjust the scraper gap at the next
trial study. As a result of the beam simulation, the reduction of the beam halo from the ion source will have aneffect on improving the beam transmission at the RFQ.
Further trial beam studies are planned to demonstrate
a 1.5 MW-equivalent beam at the RCS.

Fig. 8. Beam transmission measured 60-mA trial beam study.

J-PARC Annual Report 2017

Accelerators

9RCS

The number of particles per day [#/day]Operational status
In 2015, during operation at a beam power of
500 kW, cooling water leaks occurred twice in the neutron target. After the second incident, the RCS output
power to the MLF was limited to 200 kW to protect thetarget, due to the lack of a spare one. Since a new target
was not available until the summer of 2017, the output
power was further reduced to 150 kW after the summer shutdown period in 2016. Thus, the beam powerat the beginning of JFY2017 was 150 kW. After replacing the neutron target with a new one in the summer
shutdown of 2017, the power of the beam to the MLF
was increased stepwise from 300 to 400 kW. For beam
powers of less than 500 kW, the RCS was operated in
one-bunch mode. In this mode, only one of the two
RF buckets was filled by the injection beam from thelinac. The RCS is designed to generate 1 MW beams in
two-bunch mode, where 400 kW one-bunch beam corresponds to 800 kW two-bunch beams from a beam
dynamics viewpoint. Therefore, this operation enabled
us to confirm that the RCS had the potential to operate at an output power of 800 kW. Meanwhile, the MR
output power was steadily increased as the MR commissioning progressed. Fig. 9 shows the change in the
RCS output power with respect to time.

1E20

failure of the control system in the sextupole magnet
power supply.
Maintenance and improvements
1) Foil production
In the J-PARC RCS, the Hybrid type thick Borondoped Carbon (HBC) foil was used for charge exchange
injection. It had been produced in the KEK laboratory since the beginning of the RCS commissioning.
However, due to retirement of the expert in the HBC foil
production, it became difficult to produce the HBC foil
in KEK anymore. Therefore, the foil deposition system
in KEK was moved to the J-PARC site to continue the
HBC foil production. By using this system, we started
research and development to produce more robust foil.
With some trial-and-errors, we produced new HBC
foil. The performance of the new HBC foil was evaluatedby using the heavy ion beam facilities in the Takasaki
Advanced Radiation Research Institute of the National
Institute for Quantum and Radiological Science andTechnology before installing it in the RCS. The test
result indicated that the new HBC foil would be almost
as durable as the original KEK HBC foil. Finally, one new
foil was tested during a 10-day user operation in June,and it endured during this period. Fig. 10 shows the
new HBC foil after the 10-day operation.

300 kW 400 kW

150 kW

1E19

1E18

2017/01/01

2017/04/01

2017/07/01

2017/10/01

2018/01/01

2018/04/01

Date

Fig. 9. Changes in the RCS output power over time.

This year, there were no serious problems in the
RCS, therefore the availability of the RCS itself was quite
good. Its operation time over the year was approximately 4,556 h, excluding the commissioning time, anddowntime of approximately 28 h; therefore, its overall
availability was better than 99%. The major incidents
were a discharge of the capacitor in the RF amplifier, apuncture of the shift bump power supply unit, and a

Beam spot was deformed.
Fig. 10. The new foil after the 10-day operation.

2) Improvement of the correction QM
Numerical simulations, which included the effectof the space charge and the magnetic field errors, andthe actual beam study results, indicated that it wasnecessary to switch the betatron tunes pulse-by-pulse
between the MLF and MR operations in order to achieve

Accelerators

J-PARC Annual Report 201710

Table 2. Summary of worker radiation doses during the summer shutdown period in 2017.
Residual dose [mSv]

Number of workers

0.01–0.05

36

0.06–0.1

5

The residual doses around the RCS increased proportionally to the output power by the end of 2017,
when the 300-kW operation ended. However, when
the output was increased to 400 kW in January 2018,
we found higher beam losses than expected and theresidual dose in the RCS tunnel was higher than everbefore. In particular, we found that the highest dose

Beam commissioning result
A wider beam profile is required to reduce theresidual doses in the RCS and the peak charge density of
the injected beam for the neutron target. We achieved
this beam condition by correcting the resonance of thebetatron oscillation and extending the transverse injection painting region.
On the contrary, the MR requires beam with smaller
emittance to obtain smaller beam halo and mitigate
beam losses in the MR. However, when we use the same
operation tune as in the MLF case ((nx, ny)=(6.45,6.32)),
a large emittance growth occurs for the first 6 ms,
especially on the vertical plane. Fig. 11 shows the timedependence of the rms emittance growth calculated
from injection to extraction with smaller painting areaof 50p mm-mrad. This emittance growth is caused
mainly by the vertical stopband due to the resonanceof ny=6. The small painting applied for this operation
mode generates a large space-charge detuning andresonance crossing (See Fig. 12).
The solution to avoid this resonance is to choose avertical tune higher than in the MLF case. On the other
hand, a higher vertical tune causes a significant loss in
the MLF operation. Therefore, we extended the duration of the QDTs power supply system to switch thetune during the injection timing between the MLF and
MR operations.
5

5

Horizontal[πmm-mrad.]Residual dose distribution and exposure during
maintenance
Since the output power to the MLF was initially limited, the residual doses in the RCS were relatively small
in the summer of 2017, compared to the previous years.
Table 2 summarizes the radiation doses received
by the workers during the summer shutdown period
in 2017. A total of 41 workers were exposed to dosesof more than 0.01 mSv, and their collective dose was
1.08 man-mSv. Only five workers were exposed to residual doses of more than 0.05 mSv, and the maximum
dose received by any one worker was 0.07 mSv. Boththe collective and maximum doses were significantly
lower than those of previous years. This can be attributed to establishment of a foil maintenance procedure,
low output power to the MLF, and no serious work near
the injection area.

was 8 mSv/h, just outside the injection branch, where
no significant doses had been observed before. Afterinvestigation, we found that the reference clock of thelinac timing system had malfunctioned, making theenergy of the injection beam unstable. Correcting thisfault stabilized the beam and the residual dose fell by lessthan a half. Even so, the losses still appeared to be higher
in comparison with the preliminary tests conducted during previous beam studies. We will continue the beam
study to identify the source of these increased losses.

Rms emittancea suitable beam condition for each destination, respectively. Since there was not enough space to install an
additional new magnet set for this purpose, we considered using the existing correction quadrupole magnets(QDTs) also for the pulse-by-pulse tune change. The
QDTs were originally prepared to compensate the edge
focus effect of the injection bump magnets during theinjection period. They were installed in the summer of2014 and enabled large transverse painting for the MLF.
However, not only to correct the edge focus but also tochange the betatron tune, we had to extend the duration and reinforce the excitation current. In the summer
shutdown of 2017, we extended the duration of thepower supply of QDT from a few ms to 12 ms at the first
onset. This improvement made it possible to partiallychange the operation tunes between the MLF and MR
operations.

Vertical

4

4

3

3

2

2

1

1

0

0

5

10

15

20

0

0

5

10

15

20

Time (ms)Fig. 11. Time dependence of the rms emittance growth calculated from injection to extraction.

J-PARC Annual Report 2017

Accelerators

11
6.5

x+2y=193x=193y=19

Vertical tune y

6.45
6.4

6.35

For MR(6.43, 6.38)

6.3(6.45, 6.32)

6.25
6.2

2x–2y=00

For MLF
Detuned particles
reached y =6 line.

6.15
6.1

6.05
6

y=6

6

6.1

6.2

6.3

6.4

Horizontal tune x

6.5

Fig. 12. Tune diagram.

By using the improved QDTs, we tried to mitigate
the emittance growth by increasing the vertical operation tune away from the resonance line of ny=6 during
injection timing for the MR operation. The results areshown in Fig. 13. The emittance growth in the verticalplane was well mitigated by the new parameter, as predicted by the numerical simulation.

Emittance at 3 GeV (π mm mrad, rms)

8(6.45, 6.32)
@inj.

7.5
7
6.5

(6.429, 6.374)
@inj.

6
5.5
5
4.5
4
3.5

Emittance was reduced by
the tune adjustment
0

1

2

3

4

5

Paramerer IDs
Fig. 13. Measurement results of the vertical emittance.

Summary
In the JFY2017, the RCS user operation continues
13
to be almost stable. As of March, 3.5*10 ppp beams,
which were equivalent to 400 kW, were delivered to13
the MLF in one-bunch mode and 6.2*10 ppp beams,
which were equivalent to 750 kW at a 25-Hz operationin the RCS, were delivered to the MR. The output power
will be gradually increased toward 1 MW by carefully
monitoring the status of the neutron target and thebeam loss.
As of the beam test, we improved the correction
quadrupole magnet system to optimize the beam
operations for both the MR and MLF. We extended its
duration from a few ms to more than ten ms, enabling
us to partially change the operation tunes. We were
finally able to obtain emittances of about 4.5p mmmrad. in both the horizontal and vertical phase spacesin the MR operation parameter.
We will continue the study, aiming not only to keep
reducing the losses and generate smaller-emittancebeam but also to increase the output power further.

Accelerators

J-PARC Annual Report 2017

12

MR
Overview
The Main Ring synchrotron (MR) of J-PARC supplies
the 30-GeV proton beam alternatively to the neutrino
experimental facility in a 2.48 s period, which is called
fast-beam extraction (FX) mode, or also to the hadronexperimental facility in a 5.52 s or 5.2 s period, which iscalled slow-beam extraction (SX) mode.
Fig.14 shows the beam power history of the MR.
The beam power near the 500 kW is the beam for the
FX mode. For the SX mode, the beam power is around
50 kW.
The operation periods for each of the modes in
JFY2017 are summarized below:(1) April 1, 2017 ~ April 12, 2017: FX(2) April 13, 2017 ~ June 27, 2017: SX(3) Oct. 18, 2017 ~ Dec. 21, 2017: FX(4) Jan. 15, 2018 ~ Feb. 28, 2018: SX(5) Mar. 9, 2018 ~ Mar. 31, 2018:FX

electrode, which applied 104 kV, so the electrode wasshort-circuited, as shown in Fig. 15. A spare ESS made oftitanium was quickly transferred from the KEK Tsukuba
campus to Tokai. However, it could not keep the 100
kV without a dark current in the tunnel. Thus, it was
decided to replace the broken ESS-1 with the ESS-2,
because MR has two ESSs (ESS-1,2).

The progress and troubles for each mode of operation of the MR are described in the following sections.

Fig. 15. Broken wires in ESS-1

SX mode operation
The first SX mode operation of JFY2017 started on
April 13 with beam power of 44 kW, which is larger thanthe operation power of 42 kW in JFY2016. The repetition period was 5.52 s.
However, the ribbon type electrodes of theElectro-Static Septum Number 1 (ESS-1) were broken by the collision of the unstable beam bunch andunfortunately, broken wires touched the high voltage

The broken ESS-1 was removed from the beam line
and ESS-2 was transferred from the original position to
the place, where ESS-1 was installed. (The original ESS-2
section was connected using straight vacuum duct.)
The beam tuning of the SX mode resumed on May 24,
2017. The beam separation by one ESS was worse than
before. Thus, the beam intensity was limited to a maximum of 37 kW in order to keep the beam loss the sameas it was before the ESS-1 trouble.

Fig. 14. MR beam power history (JFY2017).

J-PARC Annual Report 2017

Accelerators

13
During the summer maintenance period, therepaired and improved spare of ESS-1 was installed in
the tunnel. ESS-2 was returned to the original position.
The second SX mode operation started on January
15, 2018. During that period, the repetition frequency
was shortened from 5.52 s to 5.2 s by reducing the flat
top length so that the SX beam power was increased byabout 6%.
The maximum beam power for the SX mode operation is limited by the performance of the target in the
hadron experimental facility. The beam power on the
hadron target is 53.4 kW in maximum, as approved by
the Nuclear Regulation Agency in Japan. Therefore,
the MR limits the maximum operation beam power to51.8 kW, which is 97% of 53.4 kW, because we have tokeep the beam power lower than 53.4 kW.
The maximum operation beam power of the SX
mode was 51 kW. The MR supplied the beam to thehadron experiment very stably.
During this SX mode period, two 8-GeV acceleration trial was carried out and each of them involved fourdays of continuous beam study. The trials were requiredby the COMET experiment, which aims to find the conversion of muon to electron without the emission ofneutrinos. During those studies, an 8-GeV beam was
successfully extracted slowly to the hadron target.
Although the beam availability for the SX modein JFY2017 was 66% due to the ESS trouble, the operation of the SX mode stabilized after we fixed the
problem.

FX mode operation
At the beginning of April 2017, beam power of
470 kW for FX mode was achieved. However, the powerincreased gradually from 150 kW to 450 kW after thesummer maintenance period, because vacuum scrubbing by beam was required for the equipment, newly
installed in the summer. After a week of scrubbing,the beam power was gradually increased more than
450 kW. Finally, the power reached 475 kW. The FX mode
operation was very stable. As a result, we achieved anavailability of 89% for the FX mode in JFY2017.
New magnet power supply
The design beam power of the FX mode is 750 kW.
Since we are going to achieve the power by shortening the repetition period from 2.48 s to 1.32 s, it isnecessary to replace and/or modify many accelerator
components.
In particular, the magnet power supplies of themain magnets must be replaced with newly developed ones. The R&D of the new power supply had been
completed. The first new power supply for the bending
magnet, which is the biggest one, has been installedin the new building for the power supply. It is shownin Fig. 16. It accumulates the regenerative electromagnetic power returns from magnets in the capacitor
bank of 2.9 F, which consists of three containers andcan keep a total of approximately 4 MJ, so that the influence on the input power from the power station will beminimized. The containers of the capacitor bank were

Fig. 16. New power supply for the bending magnet
Size: W 2.5 m x H 2.5 m x L 25 m

Accelerators

J-PARC Annual Report 201714
placed at the new power supply building, as shown in
Fig. 17.
The power supply with the bank supplies power to
16 magnets, which are 1/6 of the bending magnets in
the MR. The basic test of each component continues.
An operation test will be performed by using the real
bending magnets in the tunnel in JFY2018.
Summary
During the SX mode operation, the MR had aproblem with ESS-1. We needed a month to fix it.
However, that was just one significant trouble. Asidefrom that, the beam operation was stable. We achieved
51 kW beam power for the SX mode and 475 kW beam
power for the FX mode, respectively.
For higher repetition rate operation in the near
future, the biggest magnet power supply, the first one
to be mass-produced, has been installed in the newmagnet power supply building. The preparation for thetest of the power supply is ongoing.

Fig. 17. Capacitor banks at the new building. Three containers contain the capacitors.
D4 is one of the new power supply buildings.

Materials and Life Science
Experimental Facility
Overview
In fiscal year 2017, the operation of Materials and Life
Science Experimental Facility (MLF) started with the neutron production mercury target (#2), which had an older
design without helium bubbling system. The power was
limited to 150 kW although the operation was very stable.
In the summer maintenance period we replaced the target with a new one (#8) with helium bubbling system. The
operation started with power of 300 kW on October 24
after the summer maintenance period, then the powerincreased to 400 kW in the beginning of 2018 to continue
the stable operation to the end of fiscal year 2017. The
beam availability to the scheduled beam time in fiscal
year 2017 was 92%. The operation of the muon production target, which was replaced with a one with rotating
design in 2014, was performed without a major problem.
The operations of the neutron and muon targets werestable thanks to the great efforts of the J-PARC MLF staff.
There were many activities at the MLF in 2017. Oneof the most important international meetings was theSecond Collaboration Workshop between the European
Spallation Source (ESS) and J-PARC, which was held at
the ESS in Lund on January 18 and 19, 2018. The meeting
was carried out under the Memorandum of Collaboration(MoC) in the field of spallation neutron related development between the ESS and J-PARC. The extension
ceremony of the MoC was held in Stockholm on July 7,
2017, in the presence of the Swedish and Japanese Prime
Ministers. Ten delegates from the J-PARC center participated in the workshop to exchange information about
management of organizations, radiation and generalsafety issues, accelerator technology, neutron sources,
neutron instruments and data management.
nd
The 2 Neutron and Muon School was jointly orgath
nized with the 9 AONSA Neutron School during the period
from November 16 to 20. Forty-nine young researchers andgraduate students from thirteen countries participatedMaterials and Life Science Experimental Facility

J-PARC Annual Report 201716
in the school. They attended neutron and muon lectures,
toured the sites of J-PARC and JRR-3 and took part in experiments with neutron and muon instruments at MLF.

In this Annual Report, I would like to introduce thereaders to the research highlights and the status of MLF
in fiscal year 2017.

Neutron Source
In fiscal year 2017, the neutron production mercury target (target #2) was operated continuously at
150 kW from the previous fiscal year to June 2017 without any problem. It was used for a year and a half since
February 2016, during which the accumulated beam
power reached 1,064 MWh. In the summer outage, we
inspected the pressure-wave-induced pitting damages
on the beam injection portion at the target front by cutting out a specimen with a cutting device. We observed
damages with a maximum depth of 300 μm on the surface of specimen, however it was sufficiently shallow
compared to the critical depth of 1.3 mm.
In September 2017, a new target vessel with redesigned structure (target #8) was delivered to the MLF (seeFig. 1). It eliminated the previously designed joint structurewith bolts between the inner mercury vessel and the surrounding water shroud from the forward part of 350 mm
length, where high thermal stress was induced by beamtrips during the operating period. Instead, it adopted amonolithic structure, which was cut out from a steel blockwith a wire electric discharge machining technique.
Target #8 was equipped not only with a gas-microbubbles generator but also with a double-walled frontend to make high-speed mercury flow in a 2-mm-wide
narrow channel for mitigating the pitting damage. The
neutron production operation with target #8 began
at 300 kW on October 24. The measured results of thetemperature increase and the displacement velocity ofthe target vessel were consistent with the design values.
The beam power was increased up to 400 kW in January
2018. The steady operation continued until March and,as a result, the annual operating days reached 187.5
with an excellent operation efficiency of 92%.
The fabrication of target #9, with the same structure as target #8, was conducted 6 months after target#8’s fabrication by the same vendor. It was completed
in March 2018.
During the summer outage, the proton beam window (PBW) #2, made with aluminum alloy, was replacedwith a new one. The accumulated beam power on PBW#2 was 2,509 MWh, which was far less than the lifetime
value of 10,000 MWh, but we replaced it because one
side of the beam window was exposed to high humidity environment when small water leak occurred on thewater shroud of the target in the helium vessel in April
2015. There was no damage on the surface of PBW #2.
There was also remarkable progress in the used target
vessel management. The storage building, named RadioActivated Materials (RAM) Building, was completed in the
J-PARC site in December 2017. A shipping container was
fabricated and delivered to the RAM building in March2018 (see Fig. 2), while bids were called for fabrication ofa shielding cask with sufficient thickness needed to guarantee the allowable dose rate (< 2 mSv/h) on the surface.

Fig. 1. Photo of target vessel #8 delivered to MLF.

Fig. 2. Photo of the shipping container for used target vessels.

J-PARC Annual Report 2017

Materials and Life Science Experimental Facility

17

Neutron Science
1. User program
For the general-proposal round for 2017A, 153 general proposals and 5 new user promotion proposals
were approved from 228 submissions. For 2017B, 167
general proposals and 5 new user promotion proposals
were approved from 291 submissions. Also, 8 of a new
type of proposals, the General Proposals (Long Term)(three-years-valid proposals) were approved from 24
submissions.
A new proposal category started at two pilot instruments, Super HRPD at BL08 and NOVA at BL21, at theend of 2017B, which is a mail-in program called Fast
Track Proposal. The users send their samples to the
MLF, the MLF staff carries out the experiments on users’
behalf and sends them back the data.
2. Instruments
POLANO at BL23 is in the commissioning phase. In
November 2017, a MIEZE part of the neutron spin-echo
suit VIN ROSE at BL06 moved into a user program phase.
Other instrumental work has also been done.
A measurement of the neutron lifetime is on-goingon NOP at BL05 to achieve an accuracy of 1 s. The datataking is still continuing to reduce the uncertainty.
Multiple-wavelength neutron holography with thetime-of-flight technique was developed on NOBORU
at BL10. By using a single crystal of Eu-doped CaF2, a
3+
clear three-dimensional atomic image around Eu
2+substituted for Ca was obtained, revealing the local
structure that allows it to maintain charge neutrality.
3. International activities
The 9th AONSA School / the 2nd Neutron andMuon School was held from November 16 to 20. 49
young researchers and graduate students from Korea,
Australia, Indonesia, India, China, Taiwan, Thailand,
Malaysia, New Zealand, Vietnam, Nepal, the United
Kingdom, the Russian Federation, as well as Japan,
participated in the school. The neutron science groupcontributed 10 neutron instruments for hands-on
experiments (Fig. 3).
The J-PARC Center and CROSS hosted the J-PARC
Workshop “Deuterated Materials Enhancing Neutron
Science for Structure Function Applications” on October
19 and 20, 2017. 62 scientists discussed neutron studies
in the field of material and life siences by utlizing deuteration technology.

Fig. 3. Dr. Yamada and his student enjoying hands-on experiment at DNA at BL02 at the school.

4. Resultant outcomes
The research activities in neutron science at the
MLF resulted in more than 160 articles, including 80
peer-reviewed papers. This number includes papers
in influential journals such as Nature Materials, Nature
Communications and Scientific Reports.
The HRC beam line (BL12) group won theTechnology Prize of the Japanese Society for Neutron
Science for the development of the construction ofhigh-resolution chopper spectrometer and implementation of neutron Brillouin scattering measurement.
The prize for development technology of Sumitomo
Rubber Industries, Ltd. (Cooperation of SPring-8 / J-PARC/ K-computer and Advanced tire developments) wasawarded as Commendation for Science and Technology
by the Minister of Education, Culture, Sports, Scienceand Technology, Japan in 2017. It should be noted that
Sumitomo Rubber Industries decided to hire a fixedterm resident researcher, who works closely with the
J-PARC staff; this initiative is called J-PARC / Sumitomo
Fellowship program. The first fellow employed by thisprogram was assigned in JFY2017.

Materials and Life Science Experimental Facility

J-PARC Annual Report 201718

Neutron Device
One of the ongoing activities at the Neutron
Instrumentation Section of the MLF has been thedevelopment of a gas-based position-sensitive neutron-detection system, which adopts a two-dimensional
detector element and can read out an individual signal
line. In the present study, we have developed a new twodimensional detector element using circular cathodebumps for charge collection to establish high efficiency
in both the charge collection and the neutron detection.
The developed element has triangularly-arranged,
small-sized circular cathode bumps, which are linked
together in the x- and y-directions for the individual
signal line readout. The entire and partially magnified
photographs of a developed bump cathode element
are shown in Fig. 4.

made from alumina ceramic with thickness of 1.5 mm.
Irradiation experiments for the bump cathodeelement were performed using a neutron detection
system consisting of a pressure vessel, amplifier-shaperdiscriminator boards, optical signal transmission
devices, position encoders with field-programmablegate arrays, and a data acquisition device. The experiments were carried out under the gas condition of He /(15%) CF4 at 0.7 MPa. Figure 5 shows the flat-field image
measured by the detector, which confirmed the good
spatial homogeneity of the detector element. The analysis of the image shows that the average pixel countwas 134 with a standard deviation of σ = 13.5, whichcorresponded to an average count fluctuation of 10.1%.
The intrinsic spatial resolution can be calculated fromthe obtained flat-field image in our detector system [2].
The average intrinsic spatial resolution in the sensitive
region was 1.89 mm FWHM calculated by taking into
account the track lengths of the secondary particles
with He / (15%) CF4 at a pressure of 0.7 MPa.

Fig. 4. Entire and partially magnified photographs of a developed bump cathode element.

The developed bump cathode element consisted ofa polyimide insulator and circular cathode bumps (pads)
made from Cu on the insulator. A polyimide layer witha thickness of 0.025 mm was used as the substrate andthe thickness of the bumps was 0.02 mm. Two types ofcircular bumps, with diameters of 0.6 and 0.65 mm, were
triangularly arranged on the surface of the polyimide.
The 0.65- and 0.6-mm bumps were linked in lengthwise
direction on the bottom of the substrate using 0.1 mm
lines, and the crosswise direction on the surface of thesubstrate using 0.05 mm lines, respectively. Both lines
were arranged orthogonally. As a result, the 0.65- and0.6-mm bumps were used for detection of incident neutrons in the x- and y-directions, respectively.
The sensitive area was 128 mm × 128 mm with apitch of 1 mm in both directions. For use in the detector
system, the bump element was placed on the base plate

Fig. 5. Flat-field image under Cf-252 neutron irradiation.

References[1] K. Toh et. al., Nuclear Inst. and Meth. Phys. Res., A726 169(2013).
[2] K. Toh et. al., J. Phys. Conf. Ser. 528 (2014) 012045.

J-PARC Annual Report 2017

Materials and Life Science Experimental Facility

19

Muon Source and Science
Developments of low-emittance negative muon
beams in progress
The reduction of the beam momentum spread at
the D2 area was of crucial importance to ensure thecontrol of the stopping position for negative muons in asample that would allow depth-resolved element analysis using muonic X-ray. A major milestone towards thisgoal was achieved by tuning the entire beam-transport
optics components including the super-conducting
solenoid on the D-line. As shown in Fig. 6, a minimum
momentum width of 1.7% (as a relative Gaussian
width) with beam divergence of laterally 30 mm andvertically 60 mm of full (6σ) two-dimensional Gaussian
widths was obtained. The tuning also yielded significantly increased muon flux at a momentum of 5 MeV/c(~120 keV in energy), more than 100 times greater thanthat for the previous condition.
This development made it feasible to install a
new collimator with aluminum cover at the end of thebeam exit (see Fig. 6). The collimator has a conicallyFig. 6. (Top) Profile of the negative muon beam at the focal
point in the D2 area. (Bottom) A side view of the newbeam collimator installed at the beam exit of the D2 area.

tapered shape following the beam focusing envelopewith a hole with diameter of 50 mm at the end, reducing the distance of the focusing point from the beamexit by 200 mm compared to the previous setup. This
also allowed more freedom for placing Ge detectors
for muonic X-rays, e.g., at the upstream side of thesample.
Struggle for ultra-slow muons continued
Since the successful generation of ultra-slow
muons (USMs) at MUSE in FY2015, experimenters
had been striving to increase the yield of USMs to
the level needed for practical applications. However,they were still in a long crucial stretch of their efforts
throughout 2017, fiddling with numerous devices,
including the muon beamline (the U-line, consisting of superconducting solenoids and axial-focusing
solenoids), for optimizing the muon stopping range
in the hot tungsten target, complex laser systems
to maximize the ionization efficiency of the thermal
muonium (Mu) atoms, the electrostatic lens, and thequadrupoles for transporting the ionized USMs tothe sample position.
Among these, the bottleneck was the vacuumultraviolet (VUV) laser power for the Mu ionization.
A crystal vendor’s delay to deliver a promised highquality yttrium-gallium-aluminum-oxide (YGAG)
crystal needed for the final laser amplifier hampered
the improvement of the total ionization efficiency. In
addition, relatively low proton beam power (~150 kW
in 2017A) placed further limit to the net USM yieldby reducing the incident surface muon flux, making
the entire tuning work time-consuming and inefficient (which was improved by the ramp-up of the
proton power to ~300-400 kW in 2017B). We sincerely
hope that the crystal vendor would be able to fabricate a good YGAG crystal to avoid further efficiency
problems.
Meanwhile, a muon spin rotation spectrum was
successfully measured upon transporting a beam of
USM with 30 keV to a silver plate placed at the sample
position. The positron event data accumulated overthree days of beamtime yielded a backward-forward
asymmetry corresponding to the initial muon polarization of nearly 50%, as expected for muons after being
ionized from muoniums in the spin-triplet state.

Materials and Life Science Experimental Facility

J-PARC Annual Report 201720
ARTEMIS spectrometer at the S1 area in full service
for the Inter-university research program
Since its installation at the S1 area on the S-line,
the ARTEMIS spectrometer funded by the S1-type project for the Element Strategy Initiative on Electronic
Materials (PI: K. M. Kojima) completed commissioning
toward the end of the 2016B term and was switched
for the General-Use of KEK Inter-University Research
Program in FY2017. By the end of 2017, 17 such proposals were awarded beamtime, and 43 researchers
from 25 research institutes around the world (including
10 students and 5 re-searchers from overseas) visited
MUSE to carry out muon experiments. Owing to thehigh-proton beam flux of 400 kW attained toward theend of 2017, they enjoyed high throughput μSR measurements with a data rate as high as 200 million events
per hour.
In the meantime, ARTEMIS continued to enhance
the sample environments to meet various users’
demands. For example, the commissioning of a cryofurnace system was completed to facilitate the sample
temperature control from 1.5 K to 500 K without switching the cryostat (Fig. 7). Another development was the
sample holder furnished with a device for rotating
sample within a plane that allowed angle-resolved μSR
measurements using a single-crystalline specimen.
The on-line data acquisition system including the userinterface also underwent significant improvement toincorporate parameters for newly added experimental
conditions.

Fig. 7. Users from Toyota Central Res. Dev. Lab (Japan) andKTH Royal Institute of Technology (Sweden) are preparing the sample mounted in a cryo-furnace.

Construction of electric power substation for the
H-line in progress
While the neutron users have access to a variety offully-fledged beamlines and instruments in MLF, a partof the muon users, those with specific interest in fundamental physics experiments, is still waiting for theconstruction of the promised new beamline, the “H-line,”
in experimental hall No. 1. The beamline was named
after the original plan, which envisioned the delivery ofa “high-momentum” muon beam. Since then, the planunderwent significant revisions to meet demands fromproposed experiments that required high-muon flux aswell as momentum tunability. The detailed design ofthe beamline also made it ever clearer that the electric
power needed to drive the beamline magnets would
exceed the current supply capacity of MLF. The issue
is now being resolved by constructing a new electric
power substation near the MLF building. As the firststep, installation of cable racks and pitting of the building wall have started during this summer’s shutdown
period. Part of the construction work involves buildingof outdoor structures, which will be continued until theend of this fiscal year.

J-PARC Annual Report 2017

Materials and Life Science Experimental Facility

21

Technology Development
1. Safety operation issues
The operation of the sample environment equipment and neutron instruments in the MLF with reliablesafety is one of our most important issues. To achievethat task, the Technology Development Section has
been reviewing the safety standards.
During high-temperature experiments, the users
are obliged to monitor the status of the furnace at thebeamline, which overloads them. To reduce that load,
the sample environment team and the instrument
safety team considered this year an unattended operation. Eventually, it was decided that the unattended useof the cryo-furnace would be the first stage in introducing the unattended operation of the high-temperatureexperiments, if the following conditions are met:
1) Passed safety check by the instrument safety team.
2) Maximum temperature is less than 800 K.
3) Heater output is less than 400 W.
4) Interlock system about temperature abnormality isavailable.
Heater stops automatically above maximum temperature and has no automatic return.
5) No fire spreading by multiple holders where theheater is.
6) Monitoring the signal light of the alarm indication
system in the monitoring room.
The cryo-furnace is very common sample environment equipment in MLF, regardless of the elastic
scattering instrument and the inelastic instrument. The
List of parameters for unattended cryo-furnace operation is shown in Table 1.

The next issue is the high-field magnet operation.
Under the current rule, based on stringent criteria,
if staffs or users want to access the area around an
operating 7-T magnet, they have to stop applying themagnetic field. Now we are discussing a new rule.
2. Development of a high-durability chopper
To prepare for the upcoming 1-MW operation, it isvery important to develop a chopper and a high-speed
disk chopper. It is because the maintenance of the
choppers is a heavy work due to high activation in theiroperating area. We are developing a high-durability T0
chopper, designed for a ten-year maintenance period.
The prototype was fabricated well, and the longterm operation test continues successfully. The actualmachine will be fabricated next year and installed in
the year after that. As for the high-speed disk chopper,
we started the design of a disk shape with sufficiently
high mechanical strength and reliability for a 350-Hz
operation.
3. Preparation of advanced computational
environment
Toward the 1-MW operation, we are preparing an
advanced computational environment, which consistsof individual beamline computational environment
and a high-performance computer with high-volumestorage (200 TB × 2) in the J-PARC research building,connecting high speed optical cables (40 GbE) and network switches which are currently redundant. This year,
the installation of the optical cables was completed.
After the remaining part of the environment is installed,
the operation will start in 2019.

Table 1. List of parameters for unattended cryo-furnace operation.

BL

Type

BL01
BL02
BL09
BL14
BL20
BL20
BL21
BL21
SE

Top loading
Top loading
Top loading
Top loading
Bottom loading
Auto sample changer
Auto sample changer
Top loading
Top loading

Temperature range (K) Heater output (W)
4~600
15~68010~800
5~550
4~600
4~800
20~5005~500
5~700100, 150
50
100
100
70
150
75, 13075
240, 50

SensorRhodium iron
PlatinumK type thermocouple
Platinum
Platinum, N type thermocouple
Platinum
Platinum
Platinum
Platinum, siliconParticle and Nuclear Physics

J-PARC Neutrino Experimental Facility
Run1

Run2

Run3

Run4

Run5 Run6

Run7

Run8

Run9

30

500

25

400

20

300

15
200

Beam Power (kW)Total Accumulated POT for Physics
-Mode Beam Power-Mode Beam Power

20

 10

Accumulated POT

Neutrino Experimental Facility hosts the T2K experiment, an international collaboration of 481 researchers
from 12 nations.
For the T2K experiment, data were collected in theneutrino mode until April 12 in 2017. After the summer
shutdown, the T2K experiment was performed in theanti-neutrino mode from October 16 to December 22,
and subsequently from March 9 in 2018 until May 31.
The stable operation of a 480-kW beam was successfully
achieved. The history of the accumulated protons on
target (POT) and the beam power are plotted in Fig. 1.
20
As of March 31, 2018, T2K accumulated 12.5 × 10 POTs
20
in the anti-neutrino mode, and 15.1 × 10 POTs in the

10
100
5
0
2010

2011

2012

2013

2014

2015

2016

2017

0
2018

・Maximal beam power：484.7 kW・Integrated POT：27.618 x 1020

・ν-mode：15.131 x 1020 (54.79%)

・ν-mode：12.487 x 1020 (45.21%)

Fig. 1. History of accumulated POT and beam power since
the beginning of T2K.

Particle and Nuclear Physics

J-PARC Annual Report 201724
neutrino mode since the beginning of the experiment.
The event reconstruction algorithm of the far
detector has been improved. It resulted in an increasein the electron-like event sample by approximately
30%. Better modeling of the neutrino–nucleus interactions using near detector data was achieved by T2K.
T2K reported new results in a KEK seminar in August,including an update on the constraint of the CP phaseof neutrino oscillations with the benefit of analysis
improvement and additional data acquired until Aprilof 2017. The details are described in the highlight section of this annual report. T2K also updated the resultof the θ23 analysis, which is consistent with the maximal
mixing. Further studies for the reduction of systematic
uncertainty continue.
During the summer maintenance period, a beam
window that separates the proton beam line vacuum
from one atmospheric pressure helium in the helium
vessel was exchanged (Fig. 2). It had been sustaining
1-atm-pressure-difference for eight years since thebeginning of the experiment, and accumulating large
proton irradiations and heat impulses. As it was highly
radio-active, the exchange operation was performed
with fully remote handling. Following the preparationand tests in 2016, the exchange operation was successfully completed. The new window has operated stably
since the run restarted in October.

Fig. 2. An old beam window under removal from the beamline. Left: suspended from the remote-hoisting attachment, Right: old window in the manipulator room.

J-PARC Hadron Experimental Facility
Hadron Experimental Facility (HEF) of J-PARC isfor fixed-target experiments of particles and nuclear
physics using hadron beams produced by the slowly
extracted 30-GeV protons from the Main Ring accelerator. In FY2017, the user operation of HEF was conductedfrom April to June 2017, and from January to February
2018. In the first period, the beam power was limited
to 37 kW and the user beam time was only one month,owing to an accelerator problem. In the second period,
the repetition cycle was shortened from 5.52 s to 5.20 s,
and the stable user operation with 51 kW was realized.

Three beam lines, K1.8, K1.8BR, and KL, for high intensity K mesons (kaons) were operated. The total beam
power delivered during the FY2017 operation was
2,038 kW•days, and the data acquisition for two experiments, E07 and E31, was completed.
In the southern area of the experimental hall, theconstruction of the beam dump of the high-p beamline, the shielding wall of the COMET beam line, and the
new stage for magnet power supplies were performed
in 2017.

Strangeness/Hadron Physics Experiments
A hybrid-emulsion experiment to study double
strangeness nuclei (E07) completed the beam exposure
to the emulsions at the K1.8 beam line by June. The
photographic development of 118 modules was completed at Gifu University in February 2018. The scanningof the emulsions is in progress at Gifu University andthe Advanced Science Research Center at the Japan
Atomic Energy Agency. Several candidate events fordouble strangeness nuclei were found, although their

nuclear species were not yet uniquely identified (Fig. 3).
In the beam operation from January in 2018, theE31 experiment that studies Λ(1405) in the K d → nΣpreactions completed data acquisition at the K1.8BR
beam line, collecting four times or more statistics thanthat obtained in the previous run, aiming for the separate analysis of each isospin channel of the final Σpstates.

J-PARC Annual Report 2017

Particle and Nuclear Physics

25

Fig. 3. Overlaid photograph of the emulsion for candidate eventsof double strangeness nuclei.

Kaon Decay Experiment
The KOTO experiment is designed to study the
decay of a neutral kaon (KL) into a neutral p mesonand a pair of neutrinos. The detection of this decay is0challenging, because only two photons from p are
observable; the decay has not been observed. This
decay breaks the CP symmetry directly, and the branching fraction is theoretically well predicted in the SM of-11
particle physics as (3.0 ± 0.3) × 10 . By examining thisultra-rare decay, a new source of CP symmetry breaking
that can explain the matter–antimatter asymmetry in
the universe may be revealed.
In FY2017, KOTO continued with data acquisition
with the new “inner barrel” shower counters installed tothe detector in March 2016. In parallel, the analysis of
the data collected since FY2015 is ongoing intensively.

J-PARC Muon Experiments
COMET aims at searching for muon-to-electron-14
conversion with a sensitivity of better than 10 in thefirst phase of the experiment. Intensive R&D has been
continued in 2017 toward the start of the experiment.
The performance test of the cylindrical drift chamber,the primary detector of the physics measurement, wasstarted using cosmic-ray muons. The construction of
the Straw-tube tracker and the mass production of lutetium yttrium ortho-silicate (LYSO) used for the electron
calorimeter was launched.
The acceleration and bunched-extraction tests of
8-GeV proton beam were conducted in January andFebruary of 2018. The measurement of the beam extinction factor was performed with the secondary beam at

the K1.8 beam line, showing an excellent performanceof the J-PARC proton beam mandatory for the COMET
experiment.
An experiment for the measurement of the muon’s
anomalous magnetic moment (g-2) and EDM is underpreparation in Materials and Life Science Experimental
Facility (MLF) of J-PARC. The collaboration successfully
demonstrated the acceleration of negatively charged
muoinium ion to 90 keV using a radio frequency
quadrupole (RFQ). In addition, the developments of amuonium production target, NMR probe, spiral injection, beam profile monitor, and positron tracking
detector were performed.

Particle and Nuclear Physics

J-PARC Annual Report 201726

Highlights-1: Enhanced early hint of CP asymmetry in
the neutrino sector
Particles and antiparticles are always generated
in pairs and are related like light and shadow. Even in
the early universe, baryonic matter and its antimattermust have been evenly produced. However, the current natural world consists dominantly of matter, andantimatter is rarely observed. Almost all the antimatterproduced in the early universe seems to have vanished.
This paradox is one of the most mysterious puzzles inphysics. A key to solving this problem is to determine
whether or not there is a difference between particles
and antiparticles. This difference is called charge-parity(CP) symmetry breaking (or CP violation).
The first observed phenomena of CP violation
reported in the quark sector can be expressed by the
Cabibbo–Kobayashi–Maskawa matrix. However, it is
not sufficient to quantitatively explain the observed
matter–antimatter asymmetry. Therefore, it is important to identify other sources of CP violation. Especially,
the search for CP violation in the neutrino sector willremain one of the most interesting subjects in particle
physics in coming decades. The Tokai-to-Kamioka (T2K)
long-baseline neutrino-oscillation experiment uncovered the world’s first indication of CP violation in theneutrino sector in 2016 through analysis of the dataobtained up to that time [1], and progress with moredata is anticipated.
There are three types of neutrinos: electron neutrinos (ne), muon neutrinos (nμ), and tau neutrinos (nτ),
which are named after their charged partners. Because
neutrinos have finite mass, one type of neutrino cantransform to another type, a phenomenon known as
neutrino oscillation. Neutrino oscillation is theoretically
expressed by the Pontecorvo–Maki–Nakagawa–Sakata
matrix, parametrized by three mixing angles (θ12, θ13,and θ23) and a CP-violating phase, δCP. After the discovery of neutrino oscillation by the Super-Kamiokande(SK) experiment in 1998 [2], many experiments havebeen conducted, and the three mixing angles havebeen measured. However, no definitive measurementof a CP-violating phase has been made yet. This canbe realized by the precise measurement of the nμ → netransition that was observed by T2K in 2013 [3].
The T2K setup is described in detail in [4]. T2K useda high-intensity proton beam from J-PARC to produce amuon neutrino beam and the SK detector, 295 km awayfrom J-PARC, as its far detector. 30-GeV proton beams

were exposed to a graphite target to produce charged
pions and kaons, which were focused by three magnetic
horns. The charged mesons decayed in flight to muon
neutrinos and muons in a 94-m-long decay volume, followed by a graphite beam dump and muon monitors.
By selecting the polarity of the horn current, a neutrino
or antineutrino beam was selectively produced. The
neutrino beam provided by off-axis methods had a narrow energy spectrum, peaking at 0.6 GeV, where theneutrino oscillation at 295 km distance is maximum.
T2K began operations in January 2010 and collected
data until May 2013 with the neutrino beam. After the
discovery of the nμ → ne oscillation, data collection withthe antineutrino beam was performed from May 2014
to May 2016. The data collection from October 2016 toApril 2017 doubled the amount of neutrino beam data.
In August 2017, T2K released the new results ofthe search for CP violation with increased data and an
improved analysis method that enables signal detection
with about 30% higher efficiency [5]. The collected data21
corresponded to an exposure of 2.23 × 10 protons-on20
20
target (POT) in total, of which 14.7 × 10 and 7.6 × 10
POT were collected with the neutrino and antineutrino
mode beams, respectively. In the far detector data, 89 ne
and 7 anti-ne candidate events remained after all selection criteria were applied (Fig. 4) while approximately
67 ne and 9 anti-ne events are expected by assuming no
CP violation (δCP = 0°, ±180°) (Table 1). This difference
between theory and the observation excludes no CP

Fig. 4. Reconstructed neutrino energy of the ne (top) andanti-ne (bottom) with the expected spectrum by assuming no CP violation [5].

J-PARC Annual Report 2017

Particle and Nuclear Physics

27
Table 1. Numbers of ne and anti-ne events between the expectation in case of no CP violation and the actual
observation.

Beam

Expected(no CP violation)

Observation

Neutrino

67.4 (δCP = 0)67.7 (δCP = 180°)89

Antineutrino

9.0 (δCP = 0)
8.9 (δCP = 180°)

7

violation hypothesis with a 95% confidence level. The
most probable value of δCP, which depends on the mass
2ordering (Δm23 > 0 or < 0), is -105° for the normal order2
ing (Δm 23 > 0) assumption and -79° for the inverted2ordering (Δm 23 < 0) assumption (Fig. 5). The indicationof CP violation is clearer now than it was from the firsthint obtained in 2016.

In October 2017, T2K restarted data collection withthe antineutrino beam. During this period, a maximum
beam power of 490 kW was achieved for continuous
beam operation. The beam intensity reaches 2.45 ×
14
10 protons per pulse, which exceeds the world’s highest intensity previously recorded for a fast-extracted
beam from a proton synchrotron. This data collection
will double the antineutrino beam data by the summerof 2018. The accumulated POT from the beginning of
21
T2K operation is about to reach 3 × 10 POT. The T2K
21
Collaboration aims to extend data taking up to 20 × 10
POT with the J-PARC accelerator upgrade to perform an
initial observation of CP violation at a >99.7% confidence level for the case of maximum CP violation [6].
T2K will continue its data collection to further achieve
the goal of discovering CP violation.
References[1] K. Abe et al. (T2K Collaboration), Phys. Rev. Lett. 118, 151801(2017).
[2] Y. Fukuda et al. (Super-Kamiokande Collaboration), Phys. Rev.
Lett. 81, 1562 (1998).
[3] K. Abe et al. (T2K Collaboration), Phys. Rev. Lett. 112, 061802(2014).
[4] K. Abe et al. (T2K Collaboration), Nucl. Instrum. Methods. A
659, 106 (2011).
[5] M. Hartz, KEK Colloquium, August 4, 2017.
[6] K. Abe et al. (T2K Collaboration), arXiv: 1609.04111v1 (2016).

Fig. 5. Curves showing a degree of inconsistency with theobserved data as a function of δCP for the normal(black) and inverted (red) mass ordering assumptions.
The vertical lines show the allowed 95% confidence
intervals [5].

Particle and Nuclear Physics

J-PARC Annual Report 201728

Highlights-2: The first determination of level structure of19Λ F and a radial dependence of ΛN spin-spin interaction
strength
The γ-ray spectroscopy using Ge detectors is oneof powerful methods to study fine structures of nuclei
with a few keV or better resolution and accuracy andhas revealed various many-body aspects of nuclei inits long history. This method was successfully applied
for the first time in 1998 to hypernuclei at KEK 12-GeV
PS. Since then, light (s- and p-shell) Λ hypernuclei havebeen intensively studied by this method in order toobtain the spin-dependent interaction between Λ andnucleons (N) from structural information such as levelspacing. This was done with the help of theoreticalframeworks to connect the bare interaction and nuclear
properties of many-body systems. Recently the level19
structure of a heavy (sd-shell) Λ hypernucleus, Λ F, wasdetermined for the first time by experiment at J-PARC
Hadron Experimental Facility [1]. The structure, especially the energy spacing of the ground state doublet,
is well reproduced by theoretical model calculations
together with the existing light Λ hypernuclear data.
The data was taken at the K1.8 beam line in 2015.
19
19
The Λ F hypernucleus was produced by the F(K , p )2reaction at 1.8 GeV/c with a 20 g/cm -thick liquid CF4target, as shown in Fig. 6. The hypernuclear states wereidentified by the missing mass of the reaction by analyzing the incident K and outgoing p by K1.8 beam
spectrometer and Superconducting Kaon Spectrometer(SKS), respectively. The missing-mass resolution was
8.7 MeV (full width at half maximum, FWHM), which
was determined by energy loss in the thick target. It was19
sufficient to reject highly excited states of Λ F and back12
ground Λ C contributions. The γ-rays were measured
in coincidence with the Hyperball-J detector, which

Fig. 6. Experimental setup at K1.8 beam line. The production
19of Λ F was identified with the spectrometer system at
K1.8 beam line. The γ-rays were measured in coincidence with Hyperball-J detector.

consisted of 27 coaxial-type Ge detectors with a crystal
size of 70 mm (φ) × 70 mm (length), and PbWO4 counters
for background suppression from Compton scattering0in the Ge crystals and p decay. After an in-beam energy
232
calibration of the Ge detectors using a Th source andknown γ-rays from the target or surrounding materials,
an accuracy of 0.5 keV was achieved for the range of 0.1
to 2.5 MeV, while the energy resolution was measured
to be 4.5 keV (FWHM) for 1 MeV γ-rays.
Figure 7 shows the γ-ray spectrum after selecting
19
low-lying states region of the Λ F. In addition to the
known γ-rays from normal nuclei, four γ-rays from the19
Λ F hypernucleus were identified. The obtained energies of these γ-rays are 315.5 ±0.4(stat.)+0.6-0.5 (syst,), 895.2±0.3(stat.)±0.5(syst.), 952.81 ±1.2(stat.)+0.5-0.6 (syst.), and(syst.)
keV.
1265.6 ±1.2(stat.)+0.7-0.5
A reconstructed level structure and assignment of
γ-ray transitions are shown in Fig. 8. In the assignment,

19

Fig. 7. The γ-ray spectrum after selecting low-lying states region of Λ F. Four γ-rays from19
Λ F as well as γ-rays from ordinary nuclei were identified.

J-PARC Annual Report 2017

Particle and Nuclear Physics

29

Fig. 8. A reconstructed level scheme and γ-ray transitions of19
Λ F.

Fig. 9. An energy spacing of the ground state doublet anda radial-dependence of ΛN spin-spin interaction
strength.

we assumed weak-coupling between a Λ and the core
nucleus, which holds well in Λ hypernuclei because theΛN interaction is weaker than the NN interaction. We
also took into account the estimated cross sections of
the excited states. The observed peak widths, which arebroad for the 316 keV γ-ray by Doppler shift and narrow
for the other γ-rays, are consistent with expected values
for the lifetimes of the states.
The energy spacing of the ground state doublet isof great interest when considering the radial dependence of the effective strength of the ΛN spin-spin
interaction. In the weak coupling picture, the groundstate with spin J of the core nucleus splits into twostates, each with spin J ±1/2, when a Λ is added. Theenergy spacing is determined mainly by the spin-spin
term of the interaction between a Λ in the 0s-orbit andnucleons in the outermost orbit (valence nucleons). The
mean distance and the wave function overlap between
the Λ in the 0s-orbit and the valence nucleons vary withthe size of the Λ hypernucleus. Thus, the comparisonof the spacing among s-, p-, and sd-shell Λ hypernuclei
provides a unique test of our understanding of the ΛNinteraction and the hypernuclear structure (Fig. 9).
The spacing of 316 keV is in good agreement with
two independent shell-model calculations. Millenerpredicts it to be 305 keV from the phenomenologicalspin-dependent ΛN interaction strengths determinedfrom the p-shell Λ hypernuclear data [2]. On the other
hand, based on the shell-model calculation by Umeya

and Motoba [3] using the effective ΛN interaction
made by G-matrix method from theoretical models of
the bare interaction, Nijmegen SC97e and SC97f [4], theenergy-spacing of the ground state doublet of sd-shell
19
hypernucleus, Λ F, is expected to be 346 keV when the
spin-spin interaction strength is adjusted to reproduce
the energy spacing of 692 keV for the p-shell hypernu7
cleus, Λ Li.
The present result indicates that these theoretical frameworks work quite successfully in describing
the structure not only for light s- and p-shell Λ hypernuclei but also for heavier hypernuclei beyond thep-shell. Such precise spectroscopic studies of light toheavy Λ hypernuclei would also provide a uniquemeans to investigate the nuclear density dependenceof the baryon-baryon interactions in nuclear matter. It
may provide an essential clue in solving the hyperon
puzzle, the inconsistency between the observed maximum mass of neutron stars and the equation of statesof nuclear matter derived from experimental data on
ordinary nuclei and hypernuclei.
References[1] S. B. Yang et al., Phys. Rev. Lett. 120, 132505 (2018).
[2] D. J. Millener, Nucl. Phys. A 914, 109 (2013).
[3] A. Umeya and T. Motoba, Nucl. Phys. A 954, 242 (2016).
[4] Th. A. Rijken, V. G. J. Stoks, Y. Yamamoto, Phys. Rev. C 59, 21(1999).

Particle and Nuclear Physics

J-PARC Annual Report 201730

Highlights-3: Beam innovation strengthens the
J-PARC particle and nuclear physics program
J-PARC is a multi-purpose and multi-disciplinary
research complex with a series of proton accelerators,
LINAC, RCS, and MR, and experimental facilities. By
applying intense primary-proton beams, secondary
particles are produced and their beams are used for avariety of experiments. The power of the proton beam
extracted from the accelerator is crucial, because thenumber of particles available for performing an experiment in a limited time is proportional to the power.
With higher beam power, the purity of secondary-particle beams can also be improved by the instruments, e.g.
collimators and separators in the beam lines.
At Hadron Experimental Facility (HEF) [1] of J-PARC,
the 30-GeV proton beam is slowly-extracted from the
MR over a period of 2 seconds. In February 2018, thebeam power for the slow extraction (SX) reached 51 kW,
which is half of the initial goal. HEF is currently conducting a rich and strong physics program as the unique“Kaon Factory” with two beam lines, K1.8 and K1.8BR,
for charged K mesons (kaons) and a single beam line,
KL, for neutral kaons (Fig. 10). During FY2017, theaccumulated beam power for SX was 2,038 kW•days,
19
corresponding to 3.7 × 10 protons. Data was acquired
for the E07 experiment at K1.8 for studying double
strangeness nuclei with emulsion and the E31 experiment at K1.8BR for hyperon resonances below the KN

K1.8BR beam line
E31: Hyperon Resonance- tests for E62

threshold. The KOTO experiment at KL for the rare decay0KL → p nn was performed for better sensitivities. The
following new measurements in preparation are to be
performed in near future: X-rays from kaonic He atoms(E62), cross sections of the Σ-hyperon proton scatterings (E40), and X-rays from Ξ-hyperon atoms (E03). MR
will further increase the SX beam power toward 100 kW
over the next couple of years; the precision of the measurements and the sensitivity of the searches withkaons will be much improved, and new experiments
such as an H-dibaryon search will begin.
The proton beam hits the gold target of HEF to produce secondary particles. The current target system,
operating without problems since 2015, was originallydesigned for a beam power of 50 kW. A new system,with improvements to the target and the beam windows of the chamber so as to be durable for 90 kW
and above, is being prepared. The design was reviewed
by experts in December 2017. The system will be fabricated in FY2018 and the new target system will be
installed at HEF in FY2019.
At the South Experimental Building of HEF, a newexperiment, named COMET, will be conducted tosearch for the lepton-flavor violating muon-to-electron
conversion. In order to suppress the background in theslow extraction from MR for COMET, 8-GeV protons

K1.8 beam line
E07: double-strangeness nuclei- tests for COMET, E40, E03

KL beam line
KOTO: rare K decay
L

Fig. 10. Beam lines and experiments for the user operation of HEF in FY2017.

J-PARC Annual Report 2017

Particle and Nuclear Physics

31

Entries109

1.657018e+10

108
107
106
105

different from those used in previous g-2 experiments[2], novel techniques must be developed. As a milestone, the collaborators successfully conducted anexperiment at the D2 line of the J-PARC muon sciencefacility MUSE in MLF to generate negative muonium
atoms, which are bound states of a positive muonand two electrons, and accelerate them in a radio frequency (RF) quadrupole linac to 89 keV (Fig. 12). In thisexperiment, muons have been accelerated using an RF
accelerator for the first time [3].

Events/50 ns/41011 + incident

Entry / 10 nsec

should be grouped at 1.1-microsecond interval. The
fraction of the protons remaining in the interval, called-10
the “extinction factor”, should be less than 10 . MR
experts and COMET collaborators have been working
to realize this for many years. In February 2018, they
extracted the beam to HEF for the first time and performed the extinction measurement with the timing of
secondary particles from the target through the K1.8
beam line to the experimental area. As a preliminary-10
result, a sufficient extinction factor < 1 × 10 has beenobtained (Fig. 11); further improvements of the extinc-11
tion factor, to < 6 × 10 , are expected based on theirstudies. COMET continues the beam line and detector
construction so as to begin the experiment in timely
manner.

RF on

40
RF offsimulation

20

0

104

500

10

102
10
1
0

1000

1500

2000

Time of flight [ns]

3

1000

2000

3000

4000

5000
6000
Relative Time (nsec)

Fig. 11. Time characteristics of the secondary particles produced by the 8 GeV pulsed proton beam for the
COMET experiment.

At Materials and Life Science Experimental Facility(MLF) of J-PARC, the 3-GeV proton beam with 500 kW,
from the RCS accelerator, produces pulsed neutron andmuon beams. Basic laws in particle and nuclear physics
can be tested with them. In particular, to precisely measure muon’s anomalous magnetic moment (g-2) andelectric dipole moment (EDM), a new g-2/EDM experiment (E34) with an ultra-cold muon beam is being
designed. To realize the beam, which is completely

Fig. 12. Time-of-flight spectra of the negative-charged configuration with RF on and off. The peak of the RF on
spectrum at 830 ns corresponds to the accelerated
negative muonium atoms [3].

Our innovation on beams with high intensity
protons strengthens the particle and nuclear physics program of J-PARC, improves the diversity of theresearch, and will bring about progress in the search for
new physics.
References[1] K. Agari et al., Prog. Theore. Exp. Phys., 2012, 02B008 (2012); K.
Agari et al, ibid., 2012, 02B009 (2012).
[2] G. W. Bennett et al. (Muon g-2 Collaboration), Phys. Rev. D, 73,
072003 (2006).
[3] S. Bae et al., Phys. Rev. Accel. Beams, 21, 050101 (2018).

Cryogenics Section

Overview
The Cryogenics Section supports scientific activities
in applied superconductivity and cryogenic engineering, carried out at J-PARC. It also supplies cryogen of
liquid helium and liquid nitrogen. The support work
includes maintainance and operation of the superconducting magnet systems for the neutrino beamline, forthe muon beamline at the Materials and Life Science
Experimental Facility (MLF) and construction of themagnet systems at the Hadron Experimental Facility(HEF). It also actively conducts R&D works for future
projects at J-PARC.

Cryogenics Section

J-PARC Annual Report 201734

Cryogen Supply and Technical Support

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March 2018.

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their convenience. Its amount in FY2017 is summarized
in Fig. 2. Liquid nitrogen has been regularly provided
to the Radiation Safety Section for operation of a gas
chromatograph. It was also supplied to the users in the
MLF and the HEF.

$SUThe Cryogenics Section provides liquid helium
cryogen for physics experiments at J-PARC. The usedhelium is recycled by the helium gas recovery facility at
the Cryogenics Section. Figure 1 summarizes the liquid
helium supply in FY2017.
Liquid nitrogen was also supplied to the users forFig. 2. Liquid nitrogen supply at J-PARC from April 2017, to
March 2018.

Superconducting Magnet System for T2K
The superconducting magnet system for the T2K
experiment operated during the periods shown in
Table 1. The system worked well without disturbing
the beam time. In addition to the regular maintenances
and inspections in the summer, the filter elements inndrd
the 2 and the 3 oil separator at the compressor
were replaced with fresh ones since their operation
had reached the recommendation time. Also, welding repair was performed on some of the outdoor

piping to prevent defects by corrosion-induced thinning wall phenomena. Repair work on beam monitors
in the superconducting beam line was carried out in thesummer shutdown. In order to replace some mechanical parts of the movable monitors, the cryostats forthe monitors were opened from July 24 to 26 (Fig. 3).
After the repair work, the cryostats were closed from
September 6 to 8. There was no leak of vacuum, so thecooling operation was resumed on schedule.

Table 1. Operation history of the T2K superconducting magnet system.

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J-PARC Annual Report 2017

Cryogenics Section

35

Fig. 3. Picture of the cryostat for the beam monitor before the repair works.

Superconducting Magnet Systems at the MLF
The Cryogenic Section contributes to the operationand maintenance of the superconducting magnet systems at the Muon Science Facility (MUSE) in the MLF.
The superconducting solenoid in the Decay Muon
Line (D-line) was operated from January to the end ofJune 2017. After the annual maintenance in the summer shutdown from July to September, it restarted on
October 19. It was stopped on December 25 for the
New Year holidays, and resumed on January 5. To investigate the trouble with the power supply (PS) observedin 2016, a logging system was installed to monitor the
programmable logic controller (PLC) in the PS, and twoabnormal events were found on the signal line to reset
the PS in March and May 2017. Fortunately, the duration of these events was too short to activate the reset
operation, but we were convinced that malfunction
occurred in the PLC. So, the PLC was replaced with a
new one during the summer shutdown and no problems were found in the PS after the replacement.

Superconducting Magnet Systems at the HEF
The COMET experiment is under construction in the
Hadron South Experimental Hall (HDS) of the Hadron
Experimental Facility (HEF). The Cryogenics Section
was involved in the construction of the cryogenic system and superconducting magnets. Production of thesuperconducting solenoid magnet using radiationresistant materials is in progress for the muon source.
The design work for the helium transfer lines to themagnets and the detailed design of the cryostat of thePion Capture Solenoid were improved. The integration
plan of the magnet system, including the detectors,

was improved, as shown in Fig. 4.
The magnets are designed to be cooled by a twophase flow of liquid helium with temperatures of 4.5 K
and around 50 K for the cryogenic helium gas for theshield. The cold box (LINDE TCF-50), used for the J-PARC
E-36 experiment in FY2015, was relocated in HDS. In theoperation for E36, some of the temperature sensors in
the cold box had a problem functioning at cryogenic
temperature, thus, they were replaced to achieve nominal cooling power and stable operation. The cool-down
tests confirmed that all cryogenic temperature sensors

Cryogenics Section

J-PARC Annual Report 201736
responded accurately, which was consistent with the
expectation shown in the temperature-entropy diagram of the TCF-50. In addition, the characteristics of
the Joule-Thomson (JT) valve were also clarified andthe optimal JT operation was achieved. Finally, it wasalso clarified that the cryogenic system had a cooling
capacity of 130 W at 4.5 K with a heat load of 500 W
on the 50 K shield. The measured cooling capacity was
about 1.1 times higher than the estimated total heatload in the COMET Phase-I.

TransferTube
to MTS
CurrentLeadBox
TransferTube
to PCS

ColdBox

Muon
Transport
Solenoid

Pion
CaptureSolenoid

Detector
Solenoid

Fig. 4. Plan view of the superconducting magnet system for
the COMET Phase-I.

R&D for the Future Projects at J-PARC
The g-2/EDM project aims for the precise measurement of the anomalous magnetic moment and theelectric dipole moment of muons. This experiment was
proposed at the MUSE H-Line. A superconducting solenoid with a high field homogeneity, better than 1 ppm
locally, plays a very important role as a muon storage
ring. The review of the technical design report (TDR)
was held in 2016. Based on comments from the committee, the magnet design was modified, especially interms of the cryogenic design, so that the number ofcryocoolers could be reduced from 6 to 4.
A muonium hyperfine structure measurement,
called MuSEUM experiment, has been proposed for thesame beam line as the g-2/EDM project. In the experiment, the energy state transition in muonium will beobserved under a static magnetic field with local homogeneity of 1 ppm. A standard NMR probe to determine
the absolute magnetic field is being developed to calibrate other probes. The newly-developed probe wastested at the Argonne National Laboratory (ANL) in
March 2018, as shown in Fig. 5. It was found that theresolution could be improved from 7.6 ppb to 1.7 ppb,
however the material susceptibility of the probe structure was worse, 194 ppb, than the previous value of
70.6 ppb. A further study is in progress.

Fig. 5. Material effect measurement of a new standard probe at the ANL.

Information System

Overview
The Information System Section plans, designs,
manages and operates the network infrastructure of
J-PARC and also ensures its information security. In
terms of computing, until now, J-PARC has owed its
major computer resource for analyzing and storingdata from neutrinos, nuclear physics and MLF experiments to the KEK central computer system. The section
connects J-PARC network to the KEK central computing
system directory and helps the users to utilize the system effectively.

Status of Networking
Since 2002, the J-PARC network infrastructure,
called JLAN, has been operated independently fromKEK LAN and JAEA LAN in terms of logical structure andoperational policy. In 2017, the total number of hosts

on JLAN exceeded 5,000 and the number has increasedby 106% from the last year. The growth curve of edge
switches, wireless LAN access points and hosts (servers
and PCs) connected to JLAN are shown in Fig. 1.

Information System

J-PARC Annual Report 2017

38

300
200

of the internet and Tokai-Tsukuba connections, if the
J-PARC network can be adapted.
Figures 2 and 3 show the network utilization of
the internet from/to JLAN. Since the bandwidth capacity for the internet through the SINET is 10 Gbps, it isclear that there is enough space for additional activity. Figures 4 and 5 show the statistics of data transfer
between the Tokai site and the Tsukuba site. Figure 6
shows the usage level has been approaching half of
the upper limit, especially during the period when the
Hadron facility was running.

Edge Switches
WLAN Access Points

100

6000
4000
2000

0

0

Fig. 1. Number of hosts, edge SW and wireless AP on JLAN.

Fig. 2. Network traffic from JLAN to the internet(two hours average and five minutes peak value).

Fig. 3. Network traffic from the internet to JLAN.

No. of Hosts
connected to JLAN

SW and WLANAPIn April 2016, the National Institute of Informatics(NII) has upgraded the SINET (Japan Science Information
Network http://www.sinet.ad.jp) from version 4 to 5,
in which the backbone network was increased from40 Gbps to 100 Gbps. The SINET is not only a gatewayfrom JLAN to the internet but also an important connection between Tokai and KEK Tsukuba sites in J-PARC.
According to the SINET upgrade, the network bandwidth between Tsukuba and Tokai was increased from
1 Gbps × 8 to 10 Gbps. Beyond the current bandwidth,the upgrade offers a future option of 20 Gbps for both

J-PARC Annual Report 2017

Information System

39

Fig. 4. Network traffic from the Tsukuba site to the Tokai site.

Fig. 5. Network traffic from the Tokai site to the Tsukuba site.

Fig. 6. Peak network traffic for the recent years.

Internet Connection Services for Visitors andPublic Users of J-PARC
Since 2009, J-PARC has offered a Guest Network(GWLAN) service, which is a wireless internet connection service for short-term visitors available in almost
all J-PARC buildings. In the end of 2014, an additional
network service called User LAN has started. To use the
GWLAN, the users are required to receive beforehand apassword at the J-PARC Users Office, while in User LAN
users are authenticated by the same ID and password of
the User Support System, which is also used for dormitory reservation and other activities. From March 2016,a new service called “eduroam” has been started. The
eduroam (https://www.eduroam.org/) is the secureroaming access service developed for the international
research and education community and jointly usedamong a huge number of research institutes, universities and other facilities around the world. The eduroam
service will be a convenient third option of internet
connection service for J-PARC visitors. Figure 7 shows
this FY’s usage statistics for GWLAN, User LAN and the
newly-started eduroam service.

Information System

J-PARC Annual Report 201740

Fig. 7. Usage trends of GWLAN, User LAN and eduroam.

Status of Computing
Though J-PARC does not have computing resources
for physics analysis, since 2009, the KEK central computing system (KEKCC) at the KEK Tsukuba campus
has been mainly used. At the Neutrino (T2K), Hadronand Neutron (MLF) experiments, the data taken at
J-PARC are temporarily saved at their facilities and thenpromptly transferred, stored and analyzed at the system in Tsukuba. The storage of the system is also be
utilized as a permanent data archive for their data.

The second upgrade of the system was completed
in 2016, and the computing resources assigned to
J-PARC are shown in Table 1. Figures 8-10 show the utilization statistics of the computing resources in 2017.
The main users, who used the CPU and storage constantly, were from the Hadron experiment (KOTO) andthe Neutrino groups. The MLF group also started tostore data to tapes on the system.

Table 1. Assigned computing resources to the J-PARC activities in the KEKCC.

CPU (Intel Xeon E5-2697v3)

4700 cores

RAID Disk (GPFS)

4.5 Peta Bytes

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J-PARC Annual Report 2017

Information System

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Fig. 9. Disk usage statistics (left: trend for this FY year , right: annual trend).

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Fig. 10. Tape library usage statistics (left: trend for this FY year , right: annual trend)0/)Transmutation Studies

Overview
We have been working on R&D needed for developing nuclear transmutation technology with using
accelerator-driven systems (ADS) for volume reduction
and mitigation of harmfulness of high-level radioactive
waste with utilizing J-PARC’s research resources.
As for the Transmutation Experimental Facility(TEF) in J-PARC, in addition to a technical design reportfor the ADS Target Test Facility (TEF-T) published in
March 2017 (JAEA-Technology 2017-003, 539 pages),a safety design report for the Transmutation Physics
Experimental Facility (TEF-P) was published in February
2018 (JAEA-Technology 2017-033, 383 pages). This
report summarizes the safety design of TEF-P andcorresponds to a partial draft of documents needed toapply for the reactor installment license.
As for R&D for contributing to the ADS development, significant progress was achieved on thefollowing two topics. The first one was the successful
operation of IMMORTAL (Integrated Multifunctional
MOckup for TEF-T Real-scale TArget Loop). The heat
input by a proton beam to flowing liquid lead-bismuth
eutectic (LBE) was simulated in the operation. The LBE
temperature was elevated by 50°C by a heater, and theheat was removed by operating a heat exchanger, inwhich pressurized water was used as the secondary
coolant. Thus, the basic function of the TEF-T LBE loop

Transmutation Studies

J-PARC Annual Report 201744
was demonstrated successfully. The second topic wasa launch of displacement-per-atom (DPA) cross section
measurement by using a J-PARC’s proton beam. The
DPA is very important because it is a measure for radiation damage evaluation on materials. However, theexperimental cross section data are very scarce especially around 1 GeV, the energy region that is importantfor ADS.
Owing to these efforts on design and R&D for the
TEF program, the technical requirements for the construction of TEF have been mostly fulfilled. On the other
hand, the quick start of the construction is difficult due
to JAEA’s severe budgetary situation. The use of TEF
to obtain the necessary experimental data had beenat the heart of JAEA’s roadmap to ADS development,
while we have revised the JAEA’s roadmap so as to proceed our R&D with considering the possible delay in theconstruction of J-PARC’s experimental facility. In particular, included in the revised roadmap are enhancementof computational science in the fields of the materials
radiation damage simulation and virtual ADS simulator,
experimental data taking for validation and verificationof simulated results, and re-examination of the J-PARC’sirradiation facility. We believe this new approach will
make the J-PARC’s irradiation facility more attractive
and effective by introducing leading edge knowledge
to the purpose and specifications of the facility.
On February 19 and 20, 2018, the fourth TEF
Technical Advisory Committee (T-TAC), which was oneof the technical advisory committees under the J-PARC
International Advisory Committee, was held (Fig. 1).
The T-TAC encouraged our activity to re-examine the
J-PARC’s irradiation facility as “The proposed approachbuilds on J-PARC’s strong expertise in the field of accelerator and target technologies and addresses a scope thatencompasses not only the ADS mission but also other highpower accelerator applications.”

Fig. 1. T-TAC members and attendees.

J-PARC Annual Report 2017

Transmutation Studies

45

Research and development
Studies for proton irradiation facility
The experimental studies for proton irradiation
facility for ADS have been progressing. Concerning
the LBE spallation target design, the thermal-hydraulicperformance of the LBE target vessel was improved. In
the LBE loop experiment, the operation of IMMORTAL(Integrated Multi-functional MOckup for TEF-T
Real-scale TArget loop) has continued. Regarding
the target materials, the modification of OLLOCHI(Oxygen-controlled LBE LOop Corrosion tests in HIghtemperature) was finished. In the area of instrument
developments, the manufacturing of oxygen sensors
has been progressing as a key instrumentation technology for LBE loop system. The results of these tests aredescribed in detail below.

proton-induced heat generation and its removal. Under
the heat input condition of 50 kW by an electric heater,
IMMORTAL was stably operated with a temperature difference of 50°C. As a future step, experimental data toverify the safety analysis model for the LBE loop systems
will be acquired by simulating transient events, such as
beam over power and loss of flow accidents.
OLLOCHIThe modification to install mechanical testingmachine was finished, as shown in Fig. 3. By this uniquemodification, mechanical tests in flowing LBE became
possible. A conditioning and oxygen concentration
control test will be started, followed by a corrosion test.

LBE spallation target design
Figure 2 compares the LBE flow patterns of theoriginal and modified targets. Several stagnant regions
exist in the original model and may cause high temperature and high thermal stress zone. Some off-balanceflow also appears in the outer tube of the originalmodel. These flows may lead to a flow-induced vibration. By adjusting the target dimensions and adding
some flow-control parts, stagnant regions and off-balance flows are eliminated to make the LBE flow uniform
and smooth.

Fig. 3. Outline of the modified OLLOCHI.

Fig. 2. LBE flow patterns of the original and modified targets.

IMMORTALThe operation tests of the LBE target mockup loop
IMMORTAL have continued. We have successfully completed an operation test of the LBE loop with simulating

Oxygen sensor development
Gamma-ray irradiation experiments with a Co-60
source were performed at the Takasaki site, QST. About
5 MGy of total dose were exposed to JAEA made sensors (Ag-air type, Fig. 4) without SS housing and plastic
materials by the dose rate of 1 kGy/h. After the irradiation, the performance of the irradiated sensors was
examined, and no significant irradiation effects wereobserved.

Fig. 4. JAEA made sensors (after irradiation).

Transmutation Studies

J-PARC Annual Report 201746
Measurement of a spallation productAccurate evaluation of spallation product yields
is important for the safety of the ADS facilities. As thefirst step of the experiment, the cross section of the197
product yield from a Au sample was measured for
protons with energy range between 0.4 to 3 GeV. Afterthe proton beam irradiation, γ-rays from residual nuclei
were measured with Ge detectors. Calculated production cross sections with several reaction models werecompared with the measured values. It was found thatthe calculation with PHITS with several reaction models
127shows considerable underestimation of Xe production as shown in Fig. 5.

Fig. 6. Vacuum chamber for displacement cross section installed on a beam transport line.

Improvement of the spallation model
In the design of high-energy accelerator facilities,
such as ADS, spallation models play an important rolein estimating the radiation dose and radioactive source.
For the purpose of accurate prediction of spallation
product yields, an improvement of the spallation model
has been conducted. So far, we have proposed a newmodel to predict the fission cross sections over a wide
range of incident energies and target materials, andimplemented it in the spallation model (Fig. 7). The present model will be further improved by the experimental
result of the spallation product using protons at J-PARC.

Fig. 5. Cross section of the present experiment for 127Xe pro197
duction on Au compared with other experiments,
evaluated data, and calculations.

Displacement cross section measurement
As an index of radiation damage of materials,
displacement per atom (DPA) is widely used in many
fields, such as fission and fusion reactors and accelerator facilities. The DPA can be estimated by integratinga particle flux by the displacement cross section. Since
the experimental displacement cross section data were
scarce for protons with energy higher than 20 MeV, westarted the experiment in J-PARC with the experimental
apparatus shown Fig. 6. The displacement cross section
could be delivered from an electric resistivity increaseof a sample by proton irradiation. To prevent the defectfrom recovering by thermal motion of atoms, the sample was cooled at about 4 K by using a cryocooler. The
experiment started with copper because it is widelyused in accelerators.

Fig. 7. Fission cross section of 208Pb with the improved model.

Safety design report for TEF-P
A safety design report for TEF-P was issued in
February 2018 by complying with the new regulatory standards strengthened after the accident of
the TEPCO Fukushima Daiichi Nuclear Power Plant inMarch 2011. The TEF-P facility as a nuclear reactor facility used for testing and research is required to comply
with “Ministerial ordinance for technical standards onlocation, structure and equipment of nuclear reactor

J-PARC Annual Report 2017

Transmutation Studies

47
facilities used for testing and research (Regulation No.
21, Nuclear Regulation Authority, December 6, 2013).”To indicate to the adopting of each item in Regulation
No. 21, this report contains explanations on the safety
design of the nuclear reactor facility and instructions on
the maintenance of facilities and systems necessary for
dealing with the event of an accident. From the safety
analyses, anticipated operational occurrences (a reactivity insertion, a heat generation, etc.) and design basis
accidents (a reactivity accident, a proton beam injection, a radioactivity release into environment, etc.) wereextracted and each of them was estimated to be of no
significant external influence. Consequently, the safety
design of the TEF-P facility obtained a prospect of meeting the current licensing and approval.
Evaluation of heat removal during the failure of
TEF-P core cooling
The evaluation of the natural cooling characteristics
of TEF-P core during a failure of the core cooling system
was performed to confirm whether the core would bedamaged or not by the failure of the core cooling system.
Thermal evaluation was performed by ANSYS
with the three-dimensional heat transfer analysis. The
calculation results (Fig. 8) showed that the maximum
core temperature was 294°C which was less than thedesigned temperature criterion of 327°C. It was proventhat according to the designed condition the core temperature was lower than the assumed value during a
failure of the core cooling system.

Laser charge exchange techniqueIn the last issue of the J-PARC Annual Report 2016,
we described a laser charge exchange (LCE) techniquefor TEF-P. The LCE technique is a meticulous low-power
beam extraction technique from the high-power proton
beam stream of the J-PARC linac. The LCE device consistsof a bright laser with wavelength of 1064 nm and a lasertransport system with beam position controllers. The
laser beam is exposed to a negative proton (H ) beamfrom the J-PARC linac to strip one of the two electrons0
to convert H to neutral protons (H ). The other electron
0in the H is finally stripped by a carbon foil to obtain the+positive protons (H ) to be transported to TEF-P.
To demonstrate the LCE technique, we installed
the LCE device at the end of a 3-MeV linac in cooperation with the J-PARC accelerator division (Fig. 9). An LCE
experiment was conducted using the pulse laser beam
in FY2016, and the results were summarized in ref.[1]. In
FY2017, we conducted the LCE experiment using the con+tinuous laser beam to extract the continuous H beam.
As a result of the experiment, a charge-exchanged+-4
H beam with a power of 5.9×10 W was obtained. If
the laser light from this LCE device collided with the
H- beam (400 MeV, 250 kW) delivered from the J-PARC+
linac, a stripped H beam with a power of 0.73 W equivalent was obtained, and this value agreed well with thetheoretical value. Thus, we established an elemental
technology required for TEF, i.e., the foundations of con+trol technology for the extraction of the low-power H
beam from the high-power H beam at J-PARC.

Max. temp.
294 °C

Fig. 8. Temperature distribution during failureof the TEF-P core cooling system.

Fig. 9. Laser Charge Exchange (LCE) device. We performed laser injection (pinkarrow) and beam bending (yellow arrow) in one bending magnet.

Reference[1] H. Takei et al., Plasma and Fusion Res., 13, 2406012 (2018).

Transmutation Studies

J-PARC Annual Report 2017

48

International collaboration
Meeting and workshop
Information exchange meeting about the ADS
accelerators between MYRRHA (Multipurpose hYbrid
Research Reactor for High-tech Applications: an ADS
experimental reactor construction project by the
Belgian Nuclear Research Centre, SCK·CEN) and J-PARC
was held in Tokai from March 6 to 7, 2018. Three scientists from SCK·CEN and many participants from J-PARC
took part in the meeting (Fig. 10). Many topics, suchas the current status of accelerator development at
MYRRHA, accelerator-operation experiences andfuture development plans at J-PARC, were presented inthis meeting. In particular, the participants discussed
measures for achieving high reliability required for the
ADS accelerators. Since the exchanging information

meeting had great benefits for both sides, we decided
to hold future meetings.

Fig. 10. Attendees of the meeting.

SafetySafety

J-PARC Annual Report 201750

Safety1. Major events on safety culture and safety activities at the J-PARC Center
The major events on safety culture and safety activities at the J-PARC Center are listed in Table 1.
Every year since 2014, the J-PARC Center holds
workshop 5.23 for fostering safety culture to keep freshthe lessons of the radioactive material leak incident at
the Hadron Experimental Facility on May 23, 2013. This
year, a “Safety Day” was launched, which, in addition toworkshop 5.23, also includes a discussion of the safety
culture. The safety day took place on May 25. In themorning, we held a meeting to exchange informationon the safety efforts between the sections. The numberof participants was approximately one hundred. The
director of the J-PARC Center gave the “Safety Awards
for good examples” to the hadron section and the radiation safety section, because they reported more good
examples of safety in their daily works than the othersections. Dr. Masayuki Hagiwara from the radiation
safety section gave a scientific talk about the radiological measurement of radioactive materials at the Hadron
Experimental Facility at the time of the leak incident
and explained what actually happened then. Dr. Hiroaki
Watanabe from the hadron section introduced the
reduction trials of the radiation exposure at the replacement work of chain-clumps of the vacuum components
in the primary beam line at the Hadron Experimental
Facility. In the afternoon part of the Safety Day, workshop 5.23 for fostering safety culture was held at theauditorium of the Nuclear Science Research Institutewith 303 attendees. Mr. Hidemi Ishizaka, the representative of “Sekkyaku-koujyou-ii’nkai & peace” (Improving
Service & Peace) was invited this year; he spoke about
the importance of safety at the Tokyo Disney Resort.
The emergency drill was carried out on November
16. It was assumed that a contractor, working in the second utility building of the neutrino experimental facility,
suffered body contamination with tritiated water. The
main purpose of the drill this year was to practice themethod of transporting the victim to the distant facility
equipped with decontamination instruments.
The J-PARC Safety Audit in JFY2017 was conductedby two external auditors (Prof. Akira Tose from Niigata
University and Dr. Katsumi Hayashi from Hitachi Ltd.)on December 4. They reviewed mainly three points:
the effectiveness of the safety management system,
the emergency response system, and the promotion

Fig. 1. Emergency drillof safety culture. They suggested that the activity of“Mindful of others” should be improved further. They
also pointed out that systematic prevention of incidents and troubles ensures good scientific results.
2. Standing room of the command post for crisis
management
Previously, the room of the command post for crisis
management was shared with the meeting room at thecentral control building. After an emergency situation
occurred, crisis management equipment was installedin the meeting room. In order to improve the initial
response in case of emergency, a standing room of
the command post was urgently needed. The standing
room of the command post was equipped on the firstfloor of the J-PARC research building and was ready touse on March 22, 2018.

Fig. 2. The standing room of the command post

3. Radiological license update and facility
inspection
Applications to update the radiological license
were submitted to the Nuclear Regulation Authority on

J-PARC Annual Report 2017

Safety51
December 18. The major application items are listed inTable 2. The permits for the applications were issued on
February 26.
The safety inspection of the Hadron Experimental
Facility was successfully conducted on May 31, andthe certificate was issued on June 2 by Radiation
Management Institute, Inc. The inspection items were
the shielding construction prepared for a new beam line
and the radiation dose measurements around it in the
Hadron Experimental Facility. The corresponding radiological application had been submitted on August 5,
2016, and the permit was issued on September 27, 2016.
4. Meetings of the committee on the radiation
safety matter
The basic policies on radiation safety in the J-PARC
are supposed to be discussed by the J-PARC Radiation
Safety Committee (RSC). Meanwhile, the J-PARC Radiation
Safety Review Committee (RSRC) is expected to discussspecific subjects of radiation safety in the J-PARC. The RSC
meetings were held twice and those of the RSRC, threetimes. The major issues are summarized in Table 3.

5. Radiation exposure of radiation workers
In JFY2017, 3388 persons were registered asradiation workers. In these five years the numbers ofworkers were between 3000 and 3500, except JFY2014
when many contractors took part in the construction
work of the hadron south experimental-hall, which islocated in the radiation-controlled area of the Hadron
Experimental Facility.
The distribution of annual exposed doses issummarized in Table 4 for each category of workers: inhouse staff, users and contractors. The exposed dosesof gamma-rays and of neutrons were measured with an
optically stimulated luminescence (OSL) dosimeter andwith a plastic solid-state track detector, respectively.
All users and almost all in-house staffs and contractors
were exposed to doses below the detection limit (Not
Detected, expressed as “ND” in the table). The maximum exposed dose was 2.8 mSv. Though it was lessthan the administrative dose limit at the J-PARC (7 mSv/
year), we should continue to make an effort to reduce
the exposed doses of all workers.

Table 1. List of major events on safety in FY2017

Year

2017

2018

Date

EventsMay 25

Safety Day (Meeting to exchange safety information between thesections; Workshop for fostering safety culture)

July 7

Liaison committee on safety and health for contractors

Sep. 28, Oct. 6, 18, 27, Nov. 21

Refresher course on radiation safety for in-house staff

Nov. 16

Emergency drill assuming body contamination with HTO

Dec. 4

JFY2017 J-PARC Safety Audit

Jan. 25 - 26

5th Symposium on Safety in Accelerator Facilities

Table 2. Major application items of the radiological license

Facility
Li
RCS

Items of an application18• Beam intensity: 8.2 × 10 → 8.3 × 1018 protons/hour• Beam intensity: 8.2 × 1018 → 8.3 × 1018 protons/hour• New purpose of accelerator usage

MR• Beam intensity: 4.5 × 1017 → 4.9 × 1017 protons/hour

MLF• Construction of a new storage facility for induced radioactive material (RAM building)

NU
All• Beam intensity: 4.5 × 1017 → 4.9 × 1017 protons/hour• Relocation of an exhaust monitoring system• Optimization of the application document

Safety

J-PARC Annual Report 201752
Table 3. Radiation Safety Committee (RSC) and Radiation Safety Review Committee (RSRC) in FY2017

No.

Date

Major Issues

The Radiation Safety Committee
28thJun. 12, 2017thMar. 22, 201829

• Policy on the radiological license update for the RCS, the MLF and the
Neutrino facilities• Report on the search of a sterile neutrino at the MLF facility• Inspection of the standing command post room

The Radiation Safety Review Committee
16th• Update of the radiological license for the RCS, the MLF and the Neutrino
facilities

Jun. 15, 2017

• Revision of the operational rulesthAug. 29, 2017thMar. 7, 201817

18

• Report from the ad-hoc working group about the material irradiation
experiment at the 3N-BT area
• Revision of the radiological license update for the RCS and the Linac facilities• Relocation of the standing command post room and related revision of
the operational rules• Use of the X-ray generator at the JRB and related revision of the safety
rule for X-ray generators• Revision of the rule for reporting incidents, etc. and the standard of incident reports• Report on the implementation of the interlock system of the high-P experimental area at the HD facility• Report on the search of a sterile neutrino at the MLF facility

Table 4. Annual exposed doses in FY2017

Dose range x (mSv)# ofworkersND

0.1≤ x ≤1.0

1.0< x ≤5.0

5.0< x

Collective dose
(person mSv)

Maximum dose(mSv)

In-house staff

665

627

31

7

0

22.0

2.8

Users

1,280

1,280

0

0

0

0

0

Contractors

1,447

1,389

51

7

0

25.1

1.7

Total

3,388

3,292

82

14

0

47.1

2.8

User Service

User Service

J-PARC Annual Report 2017

54

Users Office (UO)
Outline
The J-PARC Users Office (UO) was established in2007. It opened an office on the first floor of the IBARAKI Quantum Beam Research Center in Tokai-mura, in
December 2008. UO maintains the Tokai Dormitory for
the J-PARC users. UO provides on-site and WEB support
with one-stop service for the utilization of the J-PARC.
As of March 31, 2017, UO had 14 staffs and 4 WEB Support SE staffs.
The J-PARC Users, after the approval of their experiment, follow the administrative procedures outlined on
the Users Office (UO) WEB Portal Site, related to the registration as a J-PARC User, radiation worker registration,
safety education, accommodation, invitation letter forvisa and other requirements. Then the UO staffs provide
them with support by e-mail. After their arrival at the
J-PARC, UO gives on-site assistance to the J-PARC Users, like receiving the J-PARC ID, glass badge, and safety
education. Since 2015, UO had been doing its part toimprove the J-PARC on-line experiment system andmake it more user-friendly.

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Naka

Hitachinaka

Higashi MITO Expressway

Map to J-PARC Users Office

1st row, left to right KIMURA Rie, KAWAKAMI Megumi, SAKAGAMI Keiichi, KOBAYASHI Sayuri, KATOGI Aki.
nd
2 , left to right ISOZAKI Mari, HANAWA Masahiro, ISHIKAWA Tomoko, ISHIKAWA Taeko,OKUKI Rika, KIKUCHI Ayako, SANAO Ai.

J-PARC Annual Report 2017

User Service

55

Activities of UO

J-PARC Users

Technical support

Technical contact
personResearch Proposal
Proposal Advisory
Committee

Procedures for J-PARC site
accessJ-PARC Users Office

ID cardPortal site
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Daily Life

Support for J-PARC Utilization

Accomodation
Rent-a-car
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User room
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One-stop service for J-PARC users

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User Service

J-PARC Annual Report 2017

56

User Statistics
Users in 2017 (Japanese ⁄ Foreigners, person-days)
4,500

Foreigners
Japanese

4,000
3,500
3,000
2,500
2,000
1,500
1,000
500
0

4
2017

5

6

7

8

Users in 2017 (according to facilities,
person-days)

9

10

11

12

1
2018

Other 14

Nertrino
7,754

PrivateEnterprises
1,326

MLF
14,079

2,500

2,000

HadronNertrino

Accelerator

䠄ே᪥䠅

3,000
2,500
2,000

1,500

1,500
1,000

Foreign
Organizaons
9,512

PublicOrganizaons
1,927

Hadron
9,733

MLF

3

Users in 2017 (according to organizations,person-days)

Accelerator
917

䠄ே᪥䠅

2

1,000

500

500

0

0

Japanese UniversiesForeign Organizaons

Japanese
Universies
19,704

Public Organizaons
Other

Private Enterprises

User Service

J-PARC Annual Report 201757

MLF Proposals Summary - FY2017
Table 1. Breakdown of Proposals Numbers for the 2017 Rounds
2017A

Beamline

2017B

Full Year

Submitted Approved Submitted Approved

Instrument

GU

GU

GU

GU

Submitted
PU/S

IU

Approved
ES

PU/S

IU

ES

BL01 4D-Space Access Neutron Spectrometer - 4SEASONS

18(0)

9(0)

19(1)

11(1)

0

1

1

0

1

1

BL02 Biomolecular Dynamics Spectrometer - DNA

16(1)

13(1)

18(1)

13(1)

0

1

0

0

1

0

8

1

6

0

0

0

0

0

0

0

2

0

0

0

19

0

0

10

0

0

9

7

12

3

0

1

0

0

1

0

BL03 Ibaraki Biological Crystal Diffractometer - iBIX

(100-β)(β)‡†

Accurate Neutron-Nucleus Reaction Measurement
BL04
Instrument - ANNRI
BL05 Neutron Optics and Physics - NOP

6

3

2

2

0

0

0

0

0

0

BL06 Neutron Resonance Spin Echo Spectrometers - VIN ROSE

0

0

0

0

0

0

0

0

0

0

BL08 Super High Resolution Powder Diffractometer - S-HRPD

11

8

12

8(0)

0

0

0

0

0

0

BL09 Special Environment Neutron Power Diffractometer - SPICA

0

3

0

0

0

0

0

0

0

0

Neutron Beamline for Observation and Research Use NOBORU

11

6

8

7

0

1

0

0

1

0

BL10

BL11 High-Pressure Neutron Diffractometer - PLANET

8(0)

6(0)

15(0)

8

0

1

0

0

1

0

BL12 High Resolution Chopper Spectrometer - HRC

12

7

9

3

1

0

0

1

0

0

BL14 Cold-neutron Disk-chopper Spectrometer - AMATERAS

28

10

22

6

0

1

0

0

1

0

Small and Wide Angle Neutron Scattering Instrument BL15TAIKAN

18(2)

17(2)

26(0)

11(0)

0

3

1

0

3

1

19

9

7

7

0

0

0

0

0

0

9(1)

10(1)

20(1)

15(1)

0

1

1

0

1

1

16(0)

11(0)

22(0)

5(0)

0

2

1

0

2

1

23

13

25

11(0)

0

1

2

0

1

2

13

6

19

4

0

0

0

0

0

0

44

24

20

20

18

0

0

18

0

0

BL16

High-Performance Neutron Reflectometer with a horizontal
Sample Geometry - SOFIA

BL17 Polarized Neutron Reflectometer - SHARAKU
BL18

Extreme Environment Single Crystal Neutron Diffractometer SENJUBL19 Engineering Diffractometer - TAKUMI
BL20

Ibaraki Materials Design Diffractometer iMATERIA(100-β)(β)†‡

BL21 High Intensity Total Diffractometer - NOVA

19

17

17

7

0

0

0

0

0

0

BL22 Energy Resolved Neutron Imaging System - RADEN

13(1)

11(1)

16(2)

8(2)

0

3

0

0

3

0

BL23 Polarization Analysis Neutron Spectrometer - POLANO

0

0

0

0

0

0

0

0

0

0

D1

Muon Spectrometer for Materials and Life Science
Experiments - D1

15(1)

4(0)

15(1)

9(0)

0

1

0

0

1

0

D2

Muon Spectrometer for Basic Science Experiments - D2

12(0)

7(0)

13(0)

9(0)

0

1

0

0

1

0

S1

General purpose μSR spectrometer - ARTEMIS

12(1)

9(1)

14(1)

9(1)

0

1

0

0

1

0

U

Muon U

0

0

0

0

0

1

0

0

1

0

290

211

360

233

38

20

6

29

20

6

Total

GU : General Use
PU : Project Use or Ibaraki Pref. Project Use
IU : Instrument Group Use
ES : Element Strategy† : Ibaraki Pref. Exclusive Use Beamtime (β = 80% in FY2017)‡ : J-PARC Center General Use Beamtime (100-β = 20% in FY2017)( ) : Proposal Numbers under New User Promotion or P-type proposals (D1,D2) in GU[NOTE] • The data of breakdown includes the number of urgent proposals.
• This breakdown was made in September 2018.

S : S-type Proposals

User Service

J-PARC Annual Report 2017

58

J-PARC PAC Approval Summary after the 25th Meeting
E03
P04

(Co-)
Affiliation
Title of the experiment
Spokespersons
K.Tanida
JAEA
Measurement of X rays from X Atom
U of Illinois
J.C.Peng;
Measurement of High-Mass Dimuon Production at theat UrbanaS.Sawada
50-GeV Proton Synchrotron
Champaign; KEK
Spectroscopic Study of X-Hypernucleus,+C(K , K ) Reaction

12X

Be, via the

Approval status(PAC recommendation)
Stage 2

K1.8

DeferredPrimary

Stage 2New experiment E70 based on the
S-2S spectrometer

K1.8

Beamline

E05

T.Nagae

Kyoto U

12

E06

J.Imazato

KEK

Measurement of T-violating Transverse Muon Polarization
E36 as the first step
0 ++in K -> p μ n Decays

K1.1BR

Systematic Study of Double Strangeness System with an
Stage 2
Emulsion-counter Hybrid Method

K1.8

E07
E08

K.Imai,
JAEA, Gifu U,
K.Nakazawa,
Tohoku U
H.Tamura
A.Krutenkova ITEP

E10

A.Sakaguchi,
T.Fukuda

E11

T. Nakaya, M.
Wascho

E13
E14
E15

E16

E17
E18

H.Tamura
T.Yamanaka
M.Iwasaki,
T.NagaeS.Yokkaichi

Pion double charge exchange on oxygen at J-PARC
Production of Neutron-Rich Lambda-Hypernuclei with
Osaka U, Osaka
the Double Charge-Exchange Reaction (Revised fromEC U
Initial P10)
KEK
Tohoku U
Osaka URIKEN, Kyoto U

RIKEN

R.Hayano,
U Tokyo, RIKEN
H.OutaH.Bhang,
SNU, RIKEN,
H.Outa, H.Park KRISS

E19

M.Naruki

KEK

E21

Y.KunoOsaka U

E22

S.Ajimura,
A.Sakaguchi

Osaka U

T25

S.Mihara

KEK

E26

K.Ozawa

KEK

E27

T.Nagae

Kyoto U

E29

H.Ohnishi

RIKEN

E31

H.NoumiOsaka U

T32

A.Rubbia

ETH, Zurich

P33

H.M.Shimizu

Nagoya U

E34

T. Mibe

KEK, RIKEN

E36M.Kohl,S.Shimizu

Hampton U,
Osaka U

E40

K.MiwaTohoku U

P41

M.Aoki

Osaka U

Tokai-to-Kamioka (T2K) Long Baseline Neutrino
Oscillation Experimental Proposal
Gamma-ray spectroscopy of light hypernuclei
0
Proposal for KL -> p n n-bar Experiment at J-PARC
A Search for deeply-bound kaonic nuclear states by inflight 3He(K-, n) reaction
Measurements of spectral change of vector mesons in
nuclei (previously "Electron pair spectrometer at the
J-PARC 50-GeV PS to explore the chiral symmetry in
QCD")
3

Precision spectroscopy of Kaonic He 3d->2p X-rays

StatusIn preparation

Finished

Finished
Data analysis

Stage 1

K1.8

Stage 2

K1.8

Stage 2neutrino Data taking

Stage 2
Stage 2

K1.8
KL

Finished
Data taking

Stage 2

K1.8BR

Data taking

Stage 2 for Run 0

High pRegistered as E62 with an updated
proposal

K1.8BRLi run finished, Betarget run with
S-2S

12

Coincidence Measurement of the Weak Decay of Λ C andStage 2
K1.8
the three-body weak interaction process+
High-resolution Search for Q Pentaquark in p p -> K X
Stage 2
K1.8
ReactionsPhase-I Stage 2
An Experimental Search for μ - e Conversion at a
-16
Engineering desing and operation COMET
Sensitivity of 10 with a Slow-Extracted Bunched Beamplan to be presented.
Exclusive Study on the Lambda-N Weak Interaction inStage 1K1.8
A=4 Lambda-Hypernuclei
Extinction Measurement of J-PARC Proton Beam at
Test Experiment
K1.8BR
K1.8BR(coord'ed by JPNC)
A
Search for w-meson nuclear bound states in the p-+ Z ->(A-1)
n+ w(Z-1) reaction, and for w mass modification in the Stage 1
K1.8
0
in-medium w->p γ decay+
Search for a nuclear Kbar bound state K-pp in the d(p ,Stage 2
K1.8+
K ) reaction
Search for φ-meson nuclear bound states in the pbar +Stage 1
K1.1
A
(A-1)
Z -> φ +φ(Z-1) reaction
Stage 2
Spectroscopic study of hyperon resonances below KN
PAC supports requests of a second K1.8BR
threshold via the (K ,n) reaction on Deuteronrun of 20+1.5 days in early 2018.
Towards a Long Baseline Neutrino and Nucleon Decay
Experiment with a next-generation 100 kton Liquid
Test Experiment
K1.1BR
Argon TPC detector at Okinoshima and an intensity
upgraded J-PARC Neutrino beam
Measurement of Neutron Electric Dipole Moment
Deferred
Linac
Stage 1An Experimental Proposal on a New Measurement of the
PAC needs additional time to
MLF
Muon Anomalous Magnetic Moment g-2 and Electricevaluate the FRC responses and new
Dipole Moment at J-PARC
TDR.
Stage 2
Measurement of G(K+ -> e+ n)/G(K+ -> μ+ n) and Search
PAC expects completion of the data
K1.1BRfor heavy sterile neutrinos using the TREK detector
analysis and presentation of thesystemdarkphoton search.
Stage 2
Measurement of the cross sections of Σp scatterings
Minimal commissioning and initial K1.8
DAQ to be done in June
An Experimental Search for μ - e Conversion in Nuclear-14
Field at a Sensitivity of 10 with Pulsed Proton Beam
Deferred
MLF
from RCS

Finished

Finished

Fisnished

Finished
Data analysis

Finished

Finished
Data analysis

In preparation
Reviewed in MLF/
IMSS

J-PARC Annual Report 2017

User Service

59
Approval status
Beamline
Status(PAC recommendation)
Stage 2
Pusan National Search for H-Dibaryon with a Large Acceptance Hyperon
J.K.Ahn
Commissioning and physics run plan K1.8
USpectrometerto be submitted
Stage 1
K.H.Hicks,
3-Body Hadronic Reactions for New Aspects of Baryon
Describe the achievable data quality
Ohio U, JAEA
K1.8
H.SakoSpectroscopy
for each channel and clarify thephysics output for stage 2
K.Ozawa
KEK
EDIT2013 beam test program
Test Experiment
K1.1BR Abandonded
T.Maruyama KEK
Test for 250L Liquid Argon TPC
Test Experiment
K1.1BR Withdrawn
Stage 1
H.NoumiOsaka U
Charmed Baryon Spectroscopy via the (p,D*-) reaction
The FIFC, IPNS, and E50 shouldHigh pinvestigate the beam-line feasibility
Research Proposal for COMET(E21) Calorimeter Prototype
K1.1BR had to be stopped
S.Mihara
KEK
Test ExperimentBeam Test
Y.Sugimoto
KEK
Test of fine pixel CCDs for ILC vertex detector
Test Experiment
K1.1BR not performed yet
Test of GEM Tracker, Hadron Blind Detector and LeadK1.1BR not performed yet
D.Kawama
RIKEN
Test Experimentglass EMC for the J-PARC E16 experiment
Test experiment for a performance evaluation of aK.MiwaTohoku U
scattered proton detector system for the Σp scattering Test Experiment
K1.1BR not performed yetexperiment E40
Second Test of Aerogel Cherenkov counter for the J-PARC
K1.1BR had to be stopped
A.Toyoda
KEK
Test ExperimentE36 experiment
Stage 1
A Search for Sterile Neutrino at J-PARC Materials and Life
T.Maruyama KEK
Review of the answers to the
MLF
Science Experimental Facility
questions is necessary for Stage 2
Stefan Meyer
Stage 1
Institute for
Measurement of the strong interaction induced shift andJ. Zmeskal
Beam time for the pilot run to be
K1.8BR in preparation
Subatomic
width of the 1s state of kaonic deuterium at J-PARC
allocated.
Physics
A Long Baseline Neutrino Oscillation Experiment Using
M. Yokoyama U. Tokyo
Deferredneutrino
J-PARC Neutrino Beam and Hyper-Kamiokande
A test experiment to measure neutrino cross sections
neutrino
A. Minamino Kyoto U
using a 3D grid-like neutrino detector with a water target To be arranged by IPNS and KEK-T2K monitor Finishedat the near detector hall of J-PARC neutrino beam-line
bld
neutrino
T. Fukuda
Toho U
Proposal of an emulsion-based test experiment at J-PARC Arranged by IPNS and KEK-T2K
monitor Finished
bld
Stage 1
neutrino
M. Wilking
Stony Brook U nuPRISM
Develp a plan for phase-1
infrastructure construction
R. Hayano, S.
Okada, H.
U. Tokyo, RIKEN Precision Spectroscopy of kaonic atom X-rays with TES
Stage 2
K1.8BR in preparation
Outa
BL not ready yet.
H. TamuraTohoku U
Gamma-ray spectroscopy of light hypernuclei II
Stage 2
K1.1
Exp. in
Measurement of the gamma-ray and neutron
Y. Koshio
Okayama U
background from the T2k neutrino/anti-neutrino at
Arranged by IPNS and KEK-T2K
neutrino
J-PARC B2 Hall
T. Nakaya
Kyoto U
Proposal for T2K Extended Run
Stage 1
neutrino
T. Fukuda
Nagoya U
Proposal of an emulsion-based test experiment at J-PARC Test Experimentneutrino
Measurement of displacement cross section of proton in
Carry out the experiment within the
I. Meigo
JAEA
energy region between 3 and 30 GeV for highintensityMRframework of facility development
proton accelerator facility
Extension of T60/T66 Experiment: Proposal for the Run
T. Fukuda
Nagoya U
Test Experimentneutrinofrom 2017 Autumn
Study of neutrino-nucleus ineraction at around 1GeV
MOU with T2K before Stage 1
Yokohamausing cuboid lattice neutrino detector, WAGASHI, muon
A. Minamino
TDR to be submitted for stage-2
neutrino
National U
range detectors and magnetized spectrometer, Baby
approval
MIND, at J-PARC neutrino monitor hallStage 1
T. Nagae
Kyoto U
Proposal for the next E05 run with the S-2S spectrometer
K1.8
Encourage to submit a TDR
Proposal for precise measurement of neutrinop-water
MOU with T2K before procceding toT. Fukuda
Nagoya U
neutrino
cross-section in NINJA physics run
Stage 1
Stage 1
Search for a Narrow Λ* Resonance using the p(K-, Λ)η
K. Tanida
JAEA
Encourage to submit a TDR and to K1.8BR
Reaction with the hypTPC Detector
analyze Belle data further(Co-)
Spokespersons

E42

E45
T46
T49
E50
T51
T52
T53
T54
T55
E56

E57

P58
T59

T60

E61

E62
E63
T64
E65
T66
P67
T68

E69

E70
E71
E72

Affiliation

Title of the experiment

Organization and Committees

Organization and Committees

J-PARC Annual Report 201762

Organization Structure
J-PARC Center Organizaon Chart
as of April 1, 2017

Deputy Director(Safety)
T. Ishii

Radiaon Safety Secon

Safety Division
Y.Miyamoto - K. Bessho

Y. Kasugai - M. Numajiri, K. Seki
General Safety Secon
Y. Nakane
Accelerator Secon I
H. OguriAccelerator Secon II
K.Yamamoto
Accelerator Secon III
N. Hayashi

Accelerator Division
K. Hasegawa - M. Kinsho, F. Naito

Accelerator Secon IV
Y. Yamazaki
Accelerator Secon V
Y. Hori
Accelerator Secon VI
N. Yamamoto
Accelerator Secon VII

N. Saito

F. Naito

Director

Neutron Source Secon
H. Takada - K. Haga

Deputy Director(JAEA)
M. Futakawa

Neutron Science Secon

Materials & Life Science
Division
T. Kanaya - H. Seto, K. Soyama

Neutron Instrumentaon Secon
K. Sakasai
Muon Science Secon
R. Kadono – N. Kawamura

Deputy Director(KEK)

Technology Development Secon
K. Aizawa - T. Oku

T. KosekiParcle & Nuclear Physics
Division
T. Kobayashi - T. Komatsubara, Y. Fujii

Director’s Office

Advisor (J-PARC) : S. Nagamiya: Y. Ikeda: Y. Fujii

K. Nakajima - Y. Kawakita, S. Itoh

Nuclear Transmutaon
Division
M. Futakawa - F. Maekawa

Neutrino Secon
T. Nakadaira
Hadron Secon
S. Sawada
Target Technology Development
SeconT.SasaFacility and Applicaon
Development Secon
S.MeigoCryogenics Secon
Y. Makida - K. Sasaki
Informaon System Secon
A. Manabe - K. Gorai
Operaons Support Secon
H. Yoshikawa
Public Relaons Secon
S. Okada - H. Terunuma
General Affairs SeconAdministraon Division

S. Miyamoto - K. Suzuki

S. Ejiri - S. Miyamoto

Users Affairs Secon
S. Ejiri - J. Hoshino
Users Office
K. Sakagami

J-PARC Annual Report 2017

Organization and Committees

63

Members of the Committees Organized for J-PARC(as of March, 2018)

1) Steering Committee
Yukihide Kamiya

High Energy Accelerator Research Organization (KEK), Japan

Toshikazu Ishii

High Energy Accelerator Research Organization (KEK), Japan

Katsuo Tokushuku

High Energy Accelerator Research Organization (KEK), Japan

Kazuyoshi YamadaHigh Energy Accelerator Research Organization (KEK), Japan

Seiya Yamaguchi

High Energy Accelerator Research Organization (KEK), Japan

Yukitoshi Miura

Japan Atomic Energy Agency (JAEA), Japan

Sonoko Watanabe

Japan Atomic Energy Agency (JAEA), Japan

Masayasu Takeda

Japan Atomic Energy Agency (JAEA), Japan

Hiroyuki Oigawa

Japan Atomic Energy Agency (JAEA), Japan

Kazuo Minato

Japan Atomic Energy Agency (JAEA), Japan

Naohito Saito

J-PARC Center, Japan

2) International Advisory Committee
Jean-Michel Poutissou

TRIUMF, Canada

Francis Pratt

Science and Technology Facilities Council (STFC), UK

Jun Sugiyama

Toyota Central R & D Labs., Inc., Japan

Thomas Roser

Brookhaven National Laboratory (BNL), USA

Shinian Fu

Institute of High Energy Physics (IHEP), China

Eckhard Elsen

European Organization for Nuclear Research (CERN), Switzerland

Patricia McBride

Fermi National Accelerator Laboratory (FNAL), USA

Robert Tribble

Brookhaven National Laboratory (BNL), USA

Donald F. Geesaman

Argonne National Laboratory, USA

Karlheinz Langanke

GSI Helmholzzentrum für Schwerionenforschung, Germany

Hamid Aït Abderrahim

SCK CEN, Belgium

Hirotada Ohashi

University of Tokyo, Japan

Paul Langan

Oak Ridge National Laboratory (ORNL), USA

Hidetoshi Fukuyama

Tokyo University of Science, JapanDan Alan Neumann

National Institute of Standards and Technology (NIST), USA

Andrew Dawson Taylor

Science and Technology Facilities Council (STFC), UK

3) User Consultative Committee for J-PARC
Tsuyoshi Nakaya

Kyoto University, Japan

Taku Yamanaka

Osaka University, Japan

Hiroaki Aihara

University of Tokyo, Japan

Takashi Kobayashi

High Energy Accelerator Research Organization (KEK), Japan

Hirokazu Tamura

Tohoku University, Japan

Tomofumi Nagae

Kyoto University, Japan

Takashi Nakano

Osaka University, Japan

Organization and Committees

J-PARC Annual Report 2017

64
Kazuhiro Tanaka

High Energy Accelerator Research Organization (KEK), Japan

Hiroyuki Noumi

Osaka University, Japan

Masaki Fujita

Tohoku University, Japan

Mitsuhiro Shibayama

University of Tokyo, Japan

Hideaki Kitazawa

National Institute for Materials Science(NIMS), Japan

Yoshiaki Kiyanagi

Nagoya University, Japan

Masaaki Sugiyama

Kyoto University, Japan

Tosiji Kanaya

High Energy Accelerator Research Organization (KEK), Japan

Jun Akimitsu

Okayama University/Hiroshima University, Japan

Tadashi Adachi

Sophia University, Japan

Yasuhiro Miyake

High Energy Accelerator Research Organization (KEK), JapanJun Sugiyama

Toyota Central R&D Labs., Inc., Japan

Hiroyuki Kishimoto

Sumitomo Rubber Industries, Ltd., Japan

Takashi Noma

Canon Inc., Japan

Kenya Kubo

International Christian University, Japan

Toshiro Tomida

Ibaraki Prefecture,Japan

Satoru Yamashita

University of Tokyo, Japan

Cheol-Ho Pyeon

Kyoto University, Japan

Yoshiyuki KajiJapan Atomic Energy Agency (JAEA), Japan

4) Accelerator Technical Advisory Committee
Thomas Roser

Brookhaven National Laboratory (BNL), USA

Alberto Facco

Laboratori Nazionali di Legnaro (INFN), Italy

Alan Letchford

Science and Technology Facilities Council (STFC), UK

Subrata Nath

Los Alamos National Laboratory (LANL), USA

Toshiyuki Shirai

National Institutes for Quantum and Radiological Science and Technology (QST),
Japan

Michael Plum

Oak Ridge National Laboratory (ORNL), USA

Jie Wei

Michigan State Univ., USA

Robert Zwaska

Fermi National Accelerator Laboratory (FNAL), USA

Simone Gilardoni

European Organization for Nuclear Research (CERN), Switzerland

Simone Gilardoni

European Organization for Nuclear Research (CERN), Switzerland

5) Neutron Advisory Committee
Robert McGreevy

Science and Technology Facilities Council (STFC), UK

Bertrand Blau

Paul Scherrer Institut (PSI), Switzerland

Mark Wendel

Oak Ridge National Laboratory (ORNL), USA

Yoshiaki Kiyanagi

Nagoya University, Japan

Christiane Alba-Simionesco

The Laboratoire Leon Brilloin (LLB), France

Jamie Schulz

Australian Nuclear Science and Technology Organization(ANSTO), Australia

Dimitri Argyriou

Ames Laboratory, USA

Chang Hee Lee

Korea Atomic Energy Research Institute KAERI), Korea

Mitsuhiro Shibayama

University of Tokyo, Japan

Masaaki Sugiyama

Kyoto University, Japan

J-PARC Annual Report 2017

Organization and Committees

656) Muon Science Advisory Committee
Francis Pratt

Science and Technology Facilities Council (STFC), UK

Thomas Prokscha

Paul Scherrer Institut (PSI), Switzerland

Andrew MacFarlane

University of British Columbia, Canada

Klaus Jungmann

University of Groningen, Netherland

Kenya Kubo

International Chiristian University, Japan

Toshiyuki Azuma

RIKEN, Japan

Yasuo Nozue

Osaka University, JapanJun Sugiyama

Toyota Central R & D Labs., Inc., Japan

7) Radiation Safety Committee
Yoshitomo Uwamino

RIKEN, Japan

Yoshihiro Asano

University of Hyogo, Japan

Takeshi Iimoto

University of Tokyo, Japan

Takeshi Murakami

National Institute of Radiological Science, Japan

Hiroshi Watabe

Tohoku University, Japan

Hitoshi Kobayashi

High Energy Accelerator Research Organization (KEK), Japan

Yoshihito Namito

High Energy Accelerator Research Organization (KEK), Japan

Shinichi Sasaki

High Energy Accelerator Research Organization (KEK), Japan

Kazuo Minato

Japan Atomic Energy Agency (JAEA), Japan

Hiroshi Nakashima

Japan Atomic Energy Agency (JAEA), Japan

Michio Yoshizawa

Japan Atomic Energy Agency (JAEA), Japan

8) Radiation Safety Review Committee
Tetsuro Ishii

J-PARC Center, Japan

Yukihiro Miyamoto

J-PARC Center, Japan

Masaharu Numajiri

J-PARC Center, Japan

Hidetoshi Kikunaga

Tohoku University, Japan

Hiroshi Yashima

Kyoto University, Japan

Kanenobu Tanaka

Riken,Japan

Shunsuke Yonai

National Institute of Radiological Science, Japan

Yasuhiro Yamaguchi

Comprehensive Research Organization for Science and Society (CROSS), Japan

Masami Ohkawara

Japan Atomic Energy Agency (JAEA), Japan

Akihiko Osa

Japan Atomic Energy Agency (JAEA), Japan

Makoto Kobayashi

Japan Atomic Energy Agency (JAEA), Japan

Nobukazu Toge

High Energy Accelerator Research Organization (KEK), Japan

Kazuyoshi MasumotoHigh Energy Accelerator Research Organization (KEK), Japan

Hiroshi Matsumura

High Energy Accelerator Research Organization (KEK), Japan

Kazuo Hasegawa

J-PARC Center, Japan

Yoshiaki Fujii

J-PARC Center, Japan

Takeshi Komatsubara

J-PARC Center, Japan

Kazuhiko Soyama

J-PARC Center, Japan

Kotaro Bessho

J-PARC Center, Japan

Yoshimi Kasugai

J-PARC Center, Japan

Organization and Committees

J-PARC Annual Report 2017

669) MLF Advisory Board
Jun Akimitsu

Okayama University/Hiroshima University, Japan

Masaaki Sugiyama

Kyoto University, Japan

Yoshiaki Kiyanagi

Nagoya University, Japan

Mitsuhiro Shibayama

The University of Tokyo, JapanJun Sugiyama

Toyota Central R&D Labs., Inc., Japan

Jun Takahara

Kyusyu University, Japan

Takahisa Arima

The University of Tokyo, Japan

Michihiro Furusaka

Hokkaido University, Japan

Masaki Takada

Tohoku University, Japan

Toshio Yamaguchi

Fukuoka University, Japan

Hiroshi Amitsuka

Hokkaido University, Japan

Kenya Kubo

International Christian University, Japan

Toshiji Kanaya

High Energy Accelerator Research Organization (KEK), Japan

Hideki Seto

High Energy Accelerator Research Organization (KEK), Japan

Takashi Kamiyama

High Energy Accelerator Research Organization (KEK), Japan

Toshiya Otomo

High Energy Accelerator Research Organization (KEK), Japan

Yasuhiro Miyake

High Energy Accelerator Research Organization (KEK), Japan

Ryosuke KadonoHigh Energy Accelerator Research Organization (KEK), Japan

Masatoshi Futakawa

Japan Atomic Energy Agency (JAEA), Japan

Kazuya Aizawa

Japan Atomic Energy Agency (JAEA), Japan

Masayasu Takeda

Japan Atomic Energy Agency (JAEA), Japan

Kazuhiko Soyama

Japan Atomic Energy Agency (JAEA), Japan

Kenji Nakajima

Japan Atomic Energy Agency (JAEA), Japan

Yukinobu Kawakita

Japan Atomic Energy Agency (JAEA), Japan

Jun-ichi Suzuki

Comprehensive Research Organization for Science and Society (CROSS), Japan

10) Program Advisory Committee (PAC) for Nuclear and Particle Physics Experiments at the J-PARC 50 GeV
Proton Synchrotron
Nori Aoi

Osaka University, Japan

Ryuichiro Kitano

High Energy Accelerator Research Organization (KEK), Japan

Masahiro Kuze

Tokyo Institute of Technology, Japan

Hirokazu Tamura

Tohoku University, Japan

Akira Ohnishi

Kyoto University, Japan

Kazunori Hanagaki

High Energy Accelerator Research Organization (KEK), Japan

Junji Haba

High Energy Accelerator Research Organization (KEK), Japan

Thomas E. Browder

University of Hawaii, USA

Simon I. Eidelman

Budker Institute of Nuclear Physics (BINP), Russia

Deborah Harris

Fermi National Accelerator Laboratory (FNAL), USA

Rikutaro YoshidaThomas Jefferson National Accelerator Facility, USA

Steven Kettell

Brookhaven National Laboratory (BNL), USA

Josef Pochodzalla

University of Mainz, Germany

Wolfram Weise

Technical University of Munich, Germany

William A. Zajc

Columbia University, USA

J-PARC Annual Report 2017

Organization and Committees

6711) TEF Technical Advisory Committee
Marc Schyns

SCK CEN, Belgium

Eric Pitcher

Los Alamos Neutron Science Center (LANSCE), USA

Yacine Kadi

European Organization for Nuclear Research (CERN), Switzerland

Yoshiaki Kiyanagi

Nagoya University, Japan

Toshikazu Takeda

Univesity of Fukui, Japan

Juergen Konys

Karlsruhe Institute of Technology, Germany

Minoru Takahashi

Tokyo Institute of Technology, Japan

Main Parameters

Main Parameters

J-PARC Annual Report 201770
Present main parameters of Accelerator
Linac
Accelerated Particles
EnergyPeak Current
Pulse Width
Repetition Rate
Freq. of RFQ, DTL, and SDTL
Freq. of ACS

Negative hydrogen
400 MeV
40 mA
0.5 ms
25 Hz
324 MHz972 MHzRCS

Circumference
Injection Energy
Extraction Energy
Repetition Rate
RF Frequency
Harmonic Number
Number of RF cavities
Number of Bending Magnet

348.333 m
400 MeV
3 GeV
25 Hz
0.938 MHz → 1.67 MHz2
12
24
Main Ring

Circumference
Injection Energy
Extraction Energy
Repetition Rate
RF Frequency
Harmonic Number
Number of RF cavities
Number of Bending Magnet

1567.5 m
3 GeV
30 GeV~0.4 Hz1.67 MHz → 1.72 MHz
9996

Key parameters of Materials and Life Science Experimental Facility
Injection energy
Repetition rate

3 GeV
25 Hz

Neutron Source
Target material
Number of moderators
Moderator material
Moderator temperature/pressure
Number of neutron beam extraction ports

Mercury3
Liquid hydrogen
20 K / 1.5 MPa
23

Muon Production Target
Target material
Number of muon beam extraction ports

Graphite4

Neutron Instruments*
Open for user program (general use)
Under commissioning/construction20
1/0

Muon Instruments*
Open for user program (general use)
Under commissioning/construction

3
1/0(* As of March, 2018)

Events

EventsScience Café for Science and Technology
Week (April 23)
At a Science Café for the 58th Science and Technology Week organized by the Ministry of Education,
Culture, Sports, Science and Technology, J-PARC Centergave a lecture and scientific experiments to the public.
The event was held at Science Museum in Kitanomaru
Park in Tokyo. The participants were quite interested
to see the experiments on waves created by sounds,
which explained the Neutrino oscillations in the T2K experiments conducted by J-PARC and other groups.
At Science Café

Events

J-PARC Annual Report 201772

1st J-PARC round-table conference withpress (April 27)
J-PARC Center had its 1st round-table conference
attended by 10 journalists from 7 media organizations
from in and out of Ibaraki prefecture in order to show
them the “Latest J-PARC “ while giving them tours JPARC research facilities. First in the conference, the JPARC Director, Naohito Saito, gave his speech. Mr. Saito
explained about research at J-PARC, which included
material science that has contributed to developmentsof fuel cells and new rubber materials for tires, as well as
particle/nuclear physics, such as T2K (Tokai to Kamioka)
experiments for understanding neutrino oscillation.
Following the speech, journalists were given a tour ofthe material/life science laboratory, the neutrino monitoring building, and the Hadron Experimental Facility.

Participation in the Interactions. org
meeting for promoting communications
between particle physics laboratories(May 11-12)
Interactions.org is a network of particle physics laboratory public relations. Its regular meeting was heldat the Dutch National Institute for Subatomic Physics(Nikhef ) in Holland. This year, public relations personnel from 17 laboratories from all over the world met, including representatives from CERN and Fermi National
Accelerator Laboratory (FNAL) in the U.S. etc.. They gave
reports on their communication efforts in each laboratory organization. J-PARC reported on the T2K experiment progress and its public relations plans.

and he gave a speech “Safety Efforts is Disney Resort’s
Priority”.

Mr.Hidemi Ishizuka, invited lecturer

Research Collaboration Meeting between SNS and J-PARC on spallation
neutron source (June 6-9)
A Research Collaboration Meeting between relatedparties from Neutron Source Facility at MLF of J-PARC
and Oak Ridge National Laboratory Spallation Neutron
Source (SNS) in the U.S. was held. SNS and J-PARC have
many similarities in their equipments and structures of
their facilities. In this meeting, there were exchanges of
information including views regarding developmentof high power neutron source technology in both facilities, also common issues and future cooperation between both parties were discussed on judging material
fatigue caused by 10 years of operation, welding andgrafting technology as well as technology for controlling damage caused by pressure wave.

FY2017 Workshop 5.23 for Fostering
Safety Culture at J-PARC (May 25)
To remember the lessons learned in the radioactive
material leak accident at the Hadron Experimental Facility on May 23, 2013, J-PARC holds a workshop to raisesafety awareness of the staff members every year aroundthe day of accident. Starting this fiscal year, “Safety Day”
was added as “the day J-PARC prioritizes safety”. On thatmorning, a meeting was held to exchange safety information, and in the afternoon, Workshop 5.23 was held.
The auditorium of the Nuclear Science Research Institute was the main venue for the afternoon’s workshop.
A TV conference, linking KEK (High Energy Accelerator
Research Organization) Tsukuba Campus and KEK Tokai Campus, was set up. Mr.Hidemi Ishizuka, presidentof Improving Service & Peace, was invited as a speaker,

Participants of the meetingth

The 14 Muon g-2/EDM Collaboration
Meeting (June 7-9)
The 14th Muon g-2/EDM Collaboration Meeting washeld with 51 participants from Japan, Korea, Canada,
and other nations. This meeting aims to offer world
scientists the ability to gather and promote research

J-PARC Annual Report 2017

Events73
on the precise measurement of g-2/EDM (anomalous
magnetic moment/electric dipole moment) using theultra-cold Muon beam, planning to be experimented
on Muon H line which is under preparation at MLF. In
this meeting, the current situation regarding preparation for scheduled experiments, construction status of
H line, and related U line preparation and operation
were reported by concerned parties.

city(Gifu prefecture) where Super-Kamiokande (SK) is
located, and its main event is a tour of the SK experimental area inside the Kamioka mine, 1000m below
ground level. For the first time, J-PARC Center joined
this event. J-PARC’s public relations’ staff gave an overview of J-PARC and explained about artificial generation of neutrinos. In addition, a science experiment on
the theme of magnets was presented for the audience
to learn about the principle of an accelerator.

Participants of the meeting
Gauss accelerator debuted in the event

J-PARC Hello Science Experimental Session at Nakamaru Elementary School(June 21)
J-PARC’s PR section had planned and held Hello Science Experimental Session at the Science club of Tokai
village Nakamaru Elementary School. This experimental
session has been targeted for elementary school students in Tokai village. Nakamaru Elementary School
became the third school to hold this session since it
was started two years ago. J-PARC’s PR section made a
lecture and conducted an experiment and craft with atheme “light” on that day.

Summer break science lab “Nothing isthere, but something is there! The scienceof vacuum” (July 31, August 9 and 28)
This summer, J-PARC “Hello Science” Scientific Exththperiment Class for 5 and 6 grade students from Tokai-village was held three times at Tokai-village Industry
and Information Plaza “iVil”. For the first half of the class,children measured the weight of air and saw how close
they were to the actual value. In the last half of the class,their experiment theme was the effects of no air. Children compared conditions with air and without air byobserving : how free-falling objects (light and heavy)
behave, audibility of sounds, how light travels and temperature changes and so on. All three times, there were as
many as 20 participants, and every class was very lively.

Experiment of the three primary colors of light

Participation in the Geo Space Adventure (GSA) 2017 exhibit (July 15-16)
An exploration event, “GSA (Geo Space Adventure)”,has been held every summer in Kamioka town of Hida

Children enjoyed the experiment

Events

J-PARC Annual Report 2017

74

FY2017 “Children’s Tour Day in Kasumigaseki” (August 2 to 3)
This event is jointly organized by ministries andagencies such as MEXT and offers details of operations
and office tours. It is a family-oriented event, and children have an opportunity to learn about and experience
society in general. This year, 25 agencies, ministries, etc.
offered details of their operations and office tours, etc..
J-PARC Center had an exhibition as a participating program at the former building of Ministry of Education,
Culture, Sports, Science and Technology (MEXT). The
exhibition booth was titled, “Zoom and Bang, Run andHit: Experiment with a Simple Accelerator! “ J-PARC Center explained the mechanism of an accelerator with anexperiment using a “gauss accelerator”.

Sigining ceremony of the memorandumof understanding with RaDIATE for participation in international joint research
projects (September 20)th
For 3 days from September 20, the 4 collaboration
meeting of RaDIATE (Radiation Damage In Accelerator
Target Environments) was held at Tokai-village. RaDIATE
provides a system to promote international collaboration for cooperative research on radiation damage froma high-energy proton accelerator in target and windowmaterials. During the meeting, on September 20 J-PARC
Center director Naohito Saito signed a memorandumof understanding for J-PARC participation. Since 2016,
J-PARC had requested to join the collaboration because
it saw the advantage of gaining knowledge that would
allow long-term stable operation of the facility, such as
improved functionality of targets for secondary particle
production and beam windows for experiments at J-PARC.

J-PARC Center booth at the site

J-PARC Open House (August 20)
J-PARC Center opened its facility to the public, repeating the event from previous year. During the summer, when the facility stops its operation, J-PARC invites
the public to see the Main Ring accelerator, the Materialand Life Science Experimental Facility (MLF), neutrino
monitoring building, and the Hadron Experimental
Facility, which are all otherwise off limits to the public.
Offered events were: “J-PARC lecture” , in which the audience learnt about cutting edge technologies, the “MLF
Science Café and the “Particle Physics Saloon” where theaudience enjoyed casual talks with the researchers.

Participants of RaDIATE

9th J-PARC Hello Science “ ‘Seeing’ theworld with neutron: Let’s see through materials using neutrons” (September 29)th

J-PARC Center held the 9 Science Café at Tokaivillage Industry and Information Plaza “iVil”, and Takenao Shinohara of the Neutron Instrumentation Section
gave a talk on research developing at J-PARC’s neutron
beam line “Raden (Energy Resolved Neutron Imaging
System )”. That is “visualization technique” research,seeing the inside of materials non-destructively. He explained that neutrons give a view very different compared to X-rays, which are also radiation. The audience
asked many questions. The Café ended in lively mood.

Participation in the 5th Ozora Marche2017 with “J-PARC Science Experiment
Corner” (October 21)
J-PARC Research BuildingthThis was the 4 consecutive participation of J-PARC
in “Ozora Marche” , an open market held at the grounds

J-PARC Annual Report 2017

Events75
of “Daijingu Shrine” and “Muramatsusan Kokuzoudou”
in Tokai-village Muramatsu. J-PARC Center set up acorner to have participants experience fundamental
science that supports J-PARC research. As well as theannual superconductivity roller coaster experiment, liquid nitrogen (-196°C) experiments included an experiment using liquid nitrogen to cool carbon dioxide andoxygen, which are usually in a gaseous state. Also, for a
gauss accelerator experiment, J-PARC Center demonstrated magnets and metal balls lined on a rail being
hit by another ball. As a result, the metal ball, which
was placed at the very end of the rail, shot out fasterthan the metal ball that hit the first magnet on the rail.
J-PARC corner attracted many visitors along with Tokaivillage Mayor Osamu Yamada.

booth called “Accelerators!!”. J-PARC Center demonstrated experiments with a gauss accelerator and opened aclass to build an accelerator from paperboard and ironballs. At the Public Seminar on December 2, which CROSS
conducted at Tsukuba City Hall, J-PARC Center lectured
on the principle of neutrino oscillation and gravitational
wave observations in relation to water waves and on
what J-PARC is pursuing with their neutrino experiments.

J-PARC Center booth, ”Accelerators!!”in the Science Festival on Nov. 26

KOTO experiment collaboration meeting (December 15-17)
J-PARC Center booth in the event

The 9th AONSA Neutron School / 2nd Neutron and Muon School (November 16-20)
Co-hosted by the J-PARC Center, the Comprehensive Research Organization for Science and Societythnd(CROSS) and others, the 9 AONSA Neutron School/ 2
Neutron and Muon School was held at MLF. This school
was designed for young researchers and graduate students in the Asia-Oceania region, such as Australia, China, India and South Korea. This time, 50 people from 13
countries participated. The school offered lectures byuniversity professors and conducted lab experiments
by dividing the participants into 11 neutron beamgroups and a muon beam group.

International collaborative researchers who havebeen working on KOTO experiments at the Hadron Experimental Facility met to promote rare neutral kaon
decay experiments. Thirty four researchers participatedfrom Japan, the US, South Korea, Taiwan, etc.. In themeeting, participants gave reports on the analysis status of all the acquired data, a preparation status andfuture improvements of the data readout system forthe upcoming beam time this month in addition to a
preparation status for this summer’s detection instrument improvement and future plans. Participants were
engaged in an active discussion.

thParticipation in the 17 Youngsters’ Science Festival at Hitachi city and CROSS
Public Seminar (November 26 and December 2)
On November 26, the J-PARC Center participatedthin the 17 Youngsters’ Science Festival and presented a

The group photo with participantsEvents

J-PARC Annual Report 201776

ImPACT
J-PARC information sharing meeting(December 25)
The J-PARC Center has been pursuing R&D for the“nuclear transmutation” technology to transmute
long-lived Minor Actinides, which are contained inhigh-level radioactive waste, into short-lived nuclides
by using accelerators. Additionally, the Japan Scienceand Technology Agency (JST) has been pursuing similar R&D but for long-lived fission products as one of thethemes of ImPACT (Impulsive Paradigm Change throughDisruptive Technologies) Program led by Program Manager (PM) Reiko Fujita. Because high intensity accelerators for nuclear transmutation was the common interestfor both organizations, an information exchange meeting was held at JST Tokyo headquarters in Ichigaya.The
meeting was initiated by Fujita’s greeting. J-PARC gavethe status of J-PARC’s accelerator, and reported on reliability required for the accelerators for nuclear transmutation and a development plan for such accelerators.

th

5 Symposium on Safety in Accelerator
Facilities (January 25-26)
Since the radioactive material leak incident at the
Hadron Experimental Facility in 2013, the J-PARC Centerhas held safety symposiums every year for informationsharing and discussions to improve safety with persons
involved with accelerators both inside and outside Japan. The featured topics this time were “radiation safety
education” and “ensuring safety in heavy object transportation”. The event was held with the participationof 124 attendees, including 61 from external organizations such as accelerator facilities, universities, and corporations in Japan as well as overseas.

is not satisfied with world’s strongest at this point. He
revealed that it has a future plan to increase intensity.

A participant gave some questions to Director Saito after his talk

14 th J-PARC Hello Science “Let’s Talk
About the ‘Real Strong Force’ ”thFor the 14 J-PARC Hello Science, Kyoichiro Ozawa
from the Hadron Section talked about research at the Hadron Experimental Facility. Dr. Ozawa first explained initiatives in nuclear physics, and then pointed out that researchat J-PARC is being conducted based on the core themesof “formation of hadrons from quarks” and “acquisition ofmass due to the strong force”. Dr. Ozawa responded conscientiously to each of the many questions asked during
his talk, and deepened his interaction with participants.

Established J-PARC Center Kyushu University Branch (March 2)

13 J-PARC Hello Science “J-PARC will
go forward again in high intensity thisyear!” (Janury 26)

For collaboration and cooperation of High Energy
Accelerator Research Organization (KEK) and Kyushu University, a Memorandum of Cooperation signing ceremony
was held at the J-PARC Research Building. This memorandum establishes a J-PARC branch of Kyushu University
at KEK Tokai Building No.1 and allow Kyushu University
researchers and students to cooperatively research in JPARC. It is expected that closer cooperative research relationships with universities can be achieved by establishingbranch offices for each domestic university using J-PARC.

In the first J-PARC Hello Science of 2018 held at Tokai-village Industry and Information Plaza “iVil” , J-PARC
Center Director Naohito Saito gave a speech “J-PARC will
go forward again with high intensity this year.” His talkstarted with the introduction of the J-PARC facilities andresearch. He continued to explain that high-intensity
beams are the key to high statistics and high-precision
data collection and analysis, as well as the discovery ofrare phenomena. This is why scientists all over the world
are seeking to have more powerful beams, and J-PARC

Participants of memorandum signing ceremonythJ-PARC Annual Report 2017

Events77

FY2017 Quantum Beam Science Festa/9th MLF Symposium (March 2-4, Ibaraki Prefecture Cultural Center)
FY2017 Quantum Beam Science Festa was heldwith organizers such as J-PARC Center, KEK Institute ofMaterials Structure Science, and Comprehensive Research Organization for Science and Society (CROSS).
During the event, users of J-PARC MLF and PF (Photon
Factory) gathered together in one venue, and engaged
in lively discussions about research results achieved
using quantum beams of synchrotron radiation, neuthtrons, and muons.The 9 MLF Symposium was held on
the first day, and there were reports on new technology
development at MLF and current status of beamlines
undergoing commissioning. As a first-time trial, a tourof MLF was held, and about 40 participants, mainly using synchrotron radiation at PF, entered the area of the
MLF beamlines. A keynote address and parallel sessions
were held on the second day, and on the third day, there
was a review meeting on future plans for the MLF. The
event was successful with as many as 524 participants.

Visitors
Giovanni Anelli, Group Leader, Knowledge Transfer
Group, the European Organization for Nuclear Research(CERN) (May 9)
Young-Kee Kim, Louis Block Distinguished Service Professor, University of Chicago (July 12)
Paolo Giubellino, Scientific Managing Director, Facility
for Antiproton and Ion Research in Europe GmbH (FAIR
GmbH) (August 25)
Yifang Wang, Director, Institute of High Energy Physics,
Chinese Academy of Sciences (September 8)
Kazuhiko Oigawa, Governor, Ibaraki Prefecture (November 20)

Events

J-PARC Annual Report 201778

There were 2,959 visitors to J-PARC for the period from April, 2017, to the end of March, 2018.
ln-house

Public Officers

5% 3%
Foreigners
19%

Junior-high/High school
students, teachers
18%

VIP, lawmakers 1%
University
students,
experts
19%

Business
19%
Local
residents
15%

Media 1%

Publications

Publications

J-PARC Annual Report 2017

80(A) Publications in Periodical Journals
A-001
Ninomiya, H. et al.
Neutron diffraction study of
antiferromagnetic ErNi3Ga9 in magnetic
fields(2017)
A-002
Onuki, Y. et al.
Rietveld Texture Analysis for Metals Having
Hexagonal Close-Packed Phase by Using
Time-of-Flight Neutron Diffraction at
iMATERIA
Adv. Eng. Mater., 1700227 (2017)
A-003
Miao, P. et al.
Large Magnetovolume Effect Induced byEmbedding Ferromagnetic Clusters into
Antiferromagnetic Matrix of Cobaltite
Perovskite
Adv. Mater., Vol.29, 1605991 (2017)
A-004
Abe, K. et al.
Search for an Excess of Events in the SuperKamiokande Detector in the Directions of
the Astrophysical Neutrinos Reported by the
IceCube Collaboration
Astrophys. J. Vol. 850, p. 166 (2017)
A-005
Matsuo, T. et al.
Modulation of the picosecond dynamics oftroponin by the cardiomyopathy-causing
mutation K247R of troponin T observed byquasielastic neutron scattering
BBA-Proteins and Proteomics, Vol. 1865, 17811789 (2017)
A-006
Yoshimoto, M. et al.
Unusually Stable Plastic Crystal Phase of CCl4
Confined in Graphitic Slit-shaped Micropores
from Neutron Diffraction
Chem. Lett., Vol.46, 923-925 (2017)
A-007
Yoshimura, T. et al.
Single-alkyl and multi-alkyl chain-containing
amphiphilic oligomers with several sugarside chains: solution properties andnanostructural analysis of aggregates by
SANS
Colloid Polym. Sci., Vol. 295, 793-802 (2017)
A-008
Adachi, T. et al.
Novel electronic state and superconductivity
in the electron-doped high-Tc T’superconductors
Condensed Matter, Vol. 2, 23 (2017)

A-009
WATANABE A. et al.
Ambient pressure synthesis andH-conductivity of LaSrLiH2O2
Electrochemistry, Vol.85, 88-92 (2017)

Mechanical Analysis of Pion Capture
Superconducting Solenoid System for
COMET Experiment at J-PARC
IEEE Trans. Appl. Supercond. Vol. 27, 4100205(2017)

A-010
Maekawa, F. et al.
J-PARC transmutation experimental facility
program and situation of the world
Energy Review, Vol.37(9), p. 15-18 (2017)

A-019
Iimura, S. et al.
Ferrimagnetic Cage Framework in
Ca12Fe10Si4O32Cl6
Inorg. Chem., Vol. 56, 566-572 (2017)

A-011
S. Meigo, et al.
Measurement of aluminum activation crosssection and gas production cross section for
0.4 and 3-GeV protons
EPJ Web of Conferences 146, 11039 (2017)

A-020
Park, S.-W. et al.
Transformation of the Chromium
Coordination Environment in LaCrAsO
Induced by Hydride Doping: Formation of
La2Cr2As2OyHx
Inorg. Chem., Vol. 56, 13642-13645 (2017)

A-012
Iwamoto, H. et al.
Validation of PHITS spallation models fromthe perspective of the shielding design ofTransmutation Experimental Facility
EPJ Web of Conferences 153, 01016 (2017)
A-013
Ueno, Y. et al.
New precise measurement of muonium
hyperfine structure interval at J-PARC
Hyperfine Interact. Vol. 238, p. 14 (2017)
A-014
Ueno, Y. et al.
New precise measurement of muonium
hyperfine structure interval at J-PARC
Hyperfine Interactions, 238(1), p.14_1-14_6(2017)
A-015
Hemmi, T. et al.
Evaluation of Bending Strain in Nb3Sn
Strands of CIC Conductor Using Neutron
Diffraction
IEEE Trans. Appl. Supercond. Vol.27, 1-5 (2017)
A-016
Hashimoto, T. et al.
Beamline Test of a Transition-Edge-Sensor
Spectrometer in Preparation for KaonicAtom Measurements
IEEE Trans. Appl. Supercond. Vol. 27, 2100905(2017)
A-017
Ogitsu, T. et al.
Design Study of Superconducting
Transmission Line Magnet for J-PARC MR
UpgradeIEEE Trans. Appl. Supercond. Vol. 27, 4003705(2017)
A-018
Iio, M. et al.

A-021
Onuki, Y. et al.
Improvement of magnetostrictive
properties of Fe-15mol%Ga alloy by texture
formation during high temperature uniaxial
compression deformation
ISIJ International, Vol. 57, 755-757 (2017)
A-022
Onuki, Y. et al.
Quantitative phase fraction analysis of steel
combined with texture analysis using timeof-flight neutron diffraction
J Mater Sci, Vol.52, 11643-11658 (2017)
A-023
Mizoguchi, H. et al.
Cubic Fluorite-Type CaH2 with a Small
Bandgap
J. Am. Chem. Soc., Vol. 139, 11317-11320(2017)
A-024
Oba, Y. et al.
Energy-resolved small-angle neutron
scattering from steel
J. Appl. Cryst., Vol. 50, 334-339 (2017)
A-025
Esmaeili, A. et al.
New functions and graphical user interface
attached to powder indexing software
CONOGRAPH
J. Appl. Cryst., Vol. 50, 651 (2017)
A-026
Sato, H. et al.
Inverse pole figure mapping of bulk
crystalline grains in a polycrystalline
steel plate by pulsed neutron Bragg-diptransmission imaging
J. Appl. Cryst., Vol. 50, 1601-1610 (2017)

J-PARC Annual Report 2017

Publications

81
A-027
Huang, M. et al.
Development of a correction method for thetime-of-flight prompt gamma-ray analysis
J. Appl. Phys., Vol. 121, 104901 (2017)
A-028
Hayashi, T. et al.
Interfacial interaction and glassy dynamics
in stacked thin films of poly (methyl
methacrylate)
J. Chem. Phys., Vol. 146, 203305 (2017)
A-029
Razuvaev, G. P. et al.
The low energy muon beam profile monitor
for the muon g–2/EDM experiment at J-PARC
J. Instrum. Vol. 12, C09001 (2017)
A-030
Matsukawa, T.
Evaluation of Hydrogen-Bonding Distance in
Organic Nonlinear Optical Crystals for HighOutput Terahertz-Wave Generation
J. Mol. Struc., Vol. 1134, 835-839 (2017)
A-031
Hino, M. et al.
Supermirror neutron guide system
for Neutron Resonance Spin Echo
spectrometers at a pulsed neutron source
J. Nucl. Sci. Technol., Vol. 54, 1223-1232 (2017)
A-032
Yamaguchi, T. et al.
Analysis of Prepeak Structure ofConcentrated Organic Lithium Electrolyte by
Means of Neutron Diffraction with Isotopic
Substitution and Molecular Dynamics
Simulation
J. Phys. Chem. B, Vol. 121, 5355-5362 (2017)
A-033
Fujiwara, S. et al.
Ligation-Dependent Picosecond Dynamics
in Human Hemoglobin as Revealed by
Quasielastic Neutron Scattering
J. Phys. Chem. B, Vol. 121, 8069-8077 (2017)
A-034
Yamada, T. et al.
Dynamical Behavior of Hydration Water
Molecules between Phospholipid
Membranes
J. Phys. Chem. B, Vol. 121, 8322-8329 (2017)
A-035
Price, D.L. et al.
Relaxation in a Prototype Ionic Liquid:
Influence of Water on the Dynamics
J. Phys. Chem. Lett. ,Vol. 8, 715-719 (2017)
A-036
Iida,K. et al.
Time-of-Flight Elastic and Inelastic Neutron
Scattering Studies on the Localized 4d
Electron Layered Perovskite La5Mo4O16

J. Phys. Soc. Jpn., Vol. 86, 064803 (2017)
A-037
Iida,K. et al.
Spin Resonance in the New-Structure-Type
Iron-Based Superconductor CaKFe4As4
J. Phys. Soc. Jpn., Vol. 86, 093703 (2017)
A-038
Tomiyasu, K. et al.
Magnetic Properties of Electron-Doped
LaCoO3
J. Phys. Soc. Jpn., Vol. 86, 094706 (2017)
A-039
Doi, Y. et al.
Crystal structures, magnetic properties,
and DFT calculation of B-site defected
12L-perovskites Ba2La2MW2O12 (M = Mn,
Co, Ni, Zn)
J. Phys.: Condens. Matter, Vol. 29, 365802(2017)
A-040
Abe, M. et al.
Study on the deterioration mechanism oflayered rock-salt electrodes using epitaxial
thin films–Li (Ni, Co, Mn) O2 and their Zr-O
surface modified electrodes
J. Power Sources, Vol. 345, 108-119 (2017)
A-041
Narita, Y. et al.
Fast neutron tolerance of the perpendicularanisotropy CoFeB–MgO magnetic tunnel
junctions with junction diameters between
46 and 64 nm
Japanese Journal of Applied Physics, Vol56,
0802B3 (2017)
A-042
Hosokawa, S. et al.
Impurity effects in the microscopic elastic
properties of polycrystalline Mg-Zn-Y alloys
with a synchronized long-period stacking
ordered phase
Journal of Alloys and Compounds, Vol. 695,
426-432 (2017)
A-043
Nyuui, T. et al.
Correlation between gas transport
properties and the morphology/dynamics
of crystalline fluorinated copolymer
membranes
Journal of Applied Polymer Science, Vol. 135,
45665 (2017)
A-044
Idemoto, Y. et al.
Change of local structures for 0.5Li2MnO3–
0.5LiMn1/3Ni1/3Co1/3O2 in first charge
process of different rates
Journal of Materials Science, Vol. 52, 86308649 (2017)

A-045
H. Iwamoto et al.
On-line subcriticality measurement using apulsed spallation neutron source
Journal of Nuclear Science and Technology, 54:
4, 432-443, (2017)
A-046
Kai, T. et al.
Measurements of neutronic characteristics
of rectangular and cylindrical coupledhydrogen moderators
Journal of Nuclear Science and Technology,
1-7 (2017)
A-047
Fujisaki, F. et al.
Mechanical synthesis and structuralproperties of the fast fluoride-ion conductor
PbSnF4
Journal of Solid State Chemistry, Vol. 253, 287293 (2017)
A-048
Sakai, Y. et al.
A Site and B Site Charge Orderings in an s−dLevel Controlled Perovskite Oxide PbCoO3
Journal of the American Chemical Society, Vol.
139, 4574-4581 (2017)
A-049
Seki, Y. et al.
Development of Multi-colored Neutron
Talbot–Lau Interferometer with Absorption
Grating Fabricated by Imprinting Method ofMetallic Glass
Journal of the Physical Society of Japan, Vol.
86, 44001 (2017)
A-050
Ogiwara, N. et al.
Conductance of a long rectangular channel;
Pressure dependence
Journal of the Vacuum Society of Japan,
60(12), p. 475-480 (2017)
A-051
Kamiya, J. et al.
Thermal desorption characteristics of several
charge stripper carbon films for J-PARC RCSJournal of the Vacuum Society of Japan,
60(12), p. 484-489 (2017)
A-052
Tanoue, H. et al.
Quantitative Analysis of Polymer Brush
Formation Kinetics using Quartz Crystal
Microbalance: Viscoelasticity of Polymer
Brush
Langmuir, Vol. 33, 5166-5172 (2017)
A-053
Higaki, Y. et al.
Effect of Charged Group Spacer Length
on Hydration State in Zwitterionic Poly
(sulfobetaine) Brushes
Langmuir, Vol. 33, 8404-8412 (2017)

Publications

J-PARC Annual Report 2017

82
A-054
Hori, K. et al.
Structure and Mechanical Properties of
Polybutadiene Thin Films Bound to SurfaceModified Carbon Interface
Langmuir, Vol. 33, 8883-8890 (2017)
A-055
Tanoue, H. et al.
Kinetics of Dynamic Polymer Brush
Formation
Macromolecules, Vol. 50, 5549 (2017)
A-056
Xu, PG. et al.
Evaluation of austenite volume fraction in
TRIP steel sheets using neutron diffraction
Materials Characterization, Vol. 127, 104-110(2017)
A-057
Tsuchida, N. et al.
Room-temperature creep tests underconstant load on a TRIP-aided multimicrostructure steel
Materials Science and Engineering: A, Vol. 700,
631-636 (2017)
A-058
Tomota, Y. et al.
Quantitative Evaluation of Texture andDislocations during Annealing after Hot
Deformation in Austenitic Steel Using
Neutron Diffraction
Materials Science Forum, Vol. 905, 25-30 (2017)
A-059
Harjo, S. et al.
Unusual Plastic Deformation Behavior in
Lath Martensitic Steel Containing High
Dislocation Density
Materials Science Forum, Vol. 905, 46-51 (2017)
A-060
Wan, T. et al.
Effects of grain size on ultrasonic attenuation
in type 316L stainless steel
Materials, Vol. 10(7), p. 753_1-753_17 (2017)
A-061
Ungár, T. et al.
Composite behavior of lath martensite steels
induced by plastic strain, a new paradigm
for the elastic-plastic response of martensitic
steels
Metallurgical and Materials Transactions A,
Vol. 48, 159-167 (2017)
A-062
Harjo, S. et al.
Work Hardening, Dislocation Structure,and Load Partitioning in Lath Martensite
Determined by In Situ Neutron Diffraction
Line Profile Analysis
Metallurgical and Materials Transactions A,
Vol48, 4080-4092 (2017)

A-063
Ohisa, S. et al.
Influence of solution- and thermal-annealing
processes on the sub-nanometer-orderedorganic–organic interface structure oforganic light-emitting devices
Nanoscale, Vol.9, 25-30 (2017)
A-064
Igarashi, M. et al.
Non-aqueous selective synthesis oforthosilicic acid and its oligomers
Nature Communications, Vol. 8, 140 (2017)
A-065
Ito, S. et al.
Structure of the magnetic excitations inthe spin-1/2 triangular-lattice Heisenberg
antiferromagnet Ba3CoSb2O9
Nature Communications, Vol. 8, 235 (2017)
A-066
Iizuka, R. et al.
Hydrogenation of iron in the early stage ofEarth's evolution
Nature Communications, Vol. 8, 14096 (2017)
A-067
Li, B. et al.
Polar rotor scattering as atomic-level originof low mobility and thermal conductivity ofperovskite CH3NH3PbI3Nature Communications, Vol. 8, 16086 (2017)
A-068
Ueno, A.
Cesiated surface H- ion source; Optimization
studies
New Journal of Physics (Internet), 19(1),p. 015004_1-015004_15(2017)
A-069
Miyajima, S. et al.
Neutron flux spectrum revealed by Nbbased current-biased kinetic inductancedetector with a 10B conversion layer
NUCL INSTRUM METH A, Vol842, 71-75 (2017)
A-070
Hirose, K. et al.
Simultaneous measurement of neutroninduced fission and capture cross sectionsfor 241Am at neutron energies below fission
thresholdNucl. Instr. Meth. Phys. Research A, 856 pp. 133138 (2017)
A-071
Nishiguchi, H. et al.
Development of an extremely thin-wall
straw tracker operational in vacuum–The
COMET straw tracker system
Nucl. Instrum. Methods Phys. Res. A Vol. 845,
p. 269 (2017)
A-072
Mineev, O. et al.

The design and basic performance of a Spiral
Fiber Tracker for the J-PARC E36 experiment
Nucl. Instrum. Methods Phys. Res. A Vol. 847, p.
136 (2017)
A-073
Morita, Y. et al.
Stability test for power converters in highpowered operations for J-PARC MR main
magnets
Nucl. Instrum. Methods Phys. Res. A Vol. 870, p.
12 (2017)
A-074
Shimada, T. et al.
Measurement of thermal deformation ofmagnetic alloy cores of radio frequency
cavities in 3-GeV rapid-cycling synchrotronof Japan proton accelerator researchcomplexNucl. Instrum. Methods Phys. Res. A Vol. 875, p.
92 (2017)
A-075
Ahn, J. K. et al.
J-PARC-HI Collaboration
Nucl. Phys. A Vol. 967, p. 985 (2017)
A-076
Tanaka, K. et al.
Reopening of Research Activities on
Strangeness Nuclear Physics at J-PARC
Nucl. Phys. News Vol. 27, p. 21 (2017)
A-077
Shimada, T. et al.
Measurement of thermal deformation ofmagnetic alloy cores of radio frequency
cavities in 3-GeV rapid-cycling synchrotronof Japan Proton Accelerator ResearchComplex
Nuclear Instruments and Methods in Physics
Research A, 875, p. 92-103 (2017)
A-078
Hosobata, T. et al.
Development of precision elliptic neutronfocusing supermirror
Opt. Express, Vol. 25, 20012-20024 (2017)
A-079
Akaishi, Y. et al.
High-density kaonic-proton matter (KPM)
composed of Λ*≡ K-p multiplets and its
astrophysical connections
Phys. Lett. B Vol. 774, p. 522 (2017)
A-080
Pushin, D.A. et al.
Far-field interference of a neutron whitebeam and the applications to noninvasive
phase-contrast imaging
Phys. Rev. A, Vol. 95, 043637 (2017)
A-081
Ito, T.U. et al.
Excited configurations of hydrogen in the

J-PARC Annual Report 2017

Publications

83
BaTiO3-xHx perovskite lattice associatedwith hydrogen exchange and transport
Phys. Rev. B, Vol. 95, 020301(R) (2017)
A-082
Xu, X. L. et al.
Critical slowing of quantum atomic
deuterium/hydrogen with featuresof multiferroicity in the geometricallyfrustrated system Co2(OD)3Cl/Co2(OH)3Cl
Phys. Rev. B., Vol. 95, 024111 (2017)

A-091
Kofu, M. et al.
Vibrational states of atomic hydrogen in bulk
and nanocrystalline palladium studied byneutron spectroscopy
Phys. Rev. B, 96(5), p.054304_1-054304_7(2017)
A-092
Doté, A. et al.
Fully coupled-channels complex scaling
method for the K-pp system
Phys. Rev. C Vol. 95, 062201 (2017)

A-083
Matsuura, M. et al.
Development of spin-wave-like dispersive
excitations below the pseudogap
temperature in the high-temperature
superconductor La2-xSrxCuO4
Phys. Rev. B,Vol. 95, 024504 (2017)

A-093
Honda, R. et al.
Missing-mass spectroscopy with the 6Li(π-,K+)X reaction to search for Λ6 H
Phys. Rev. C Vol. 96, 014005(2017)

A-084
Kamazawa, K. et al.
Interaction of spin-orbital-lattice degrees
of freedom: Vibronic state of the cornersharing-tetrahedral frustrated spin system
HoBaFe4O7 by dynamical Jahn-Teller effectPhys. Rev. B, Vol. 95, 104413 (2017)

A-094
Abe, K. et al.
Search for proton decay via p → e+π0 and
p → μ+π0 in 0.31 megaton·years exposureof the Super-Kamiokande water Cherenkov
detectorPhys. Rev. D Vol. 95, 012004 (2017)

A-085
Miao, P. et al.
Hole-doping-induced melting of spin-stateordering in PrBaCo2O5.5+x
Phys. Rev. B, Vol. 95, 125123 (2017)

A-095
Abe, K. et al.
First measurement of the muon neutrino
charged current single pion production crosssection on water with the T2K near detector
Phys. Rev. D Vol. 95, 012010 (2017)

A-086
Klotz, S. et al.
Bulk moduli and equations of state of ice VII
and ice VIII
Phys. Rev. B,Vol. 95, 174111 (2017)
A-087
Iwasa, K. et al.
Crystalline-electric-field excitations andspin dynamics in Ce3Co4Sn13 semimetallic
chiral-lattice phasePhys. Rev. B, Vol. 95, 195156 (2017)
A-088
Babkevich, P. et al.
Magnetic excitations from two-dimensional
interpenetrating Cu framework in
Ba2Cu3O4Cl2
Phys. Rev. B, Vol. 96, 014410 (2017)
A-089
Kofu, M. et al.
Vibrational states of atomic hydrogen in bulk
and nanocrystalline palladium studied byneutron spectroscopy
Phys. Rev. B, Vol. 96, 054304 (2017)
A-090
Wang, C. et al.
Observation of magnetoelastic effects in aquasi-one-dimensional spiral magnet
Phys. Rev. B, Vol. 96, 085111 (2017)

A-096
Abe, K. et al.
Search for Lorentz and CPT violation using
sidereal time dependence of neutrino flavor
transitions over a short baseline
Phys. Rev. D Vol. 95, 111101 (2017)
A-097
Abe, K. et al.
Updated T2K measurements of muon
neutrino and antineutrino disappearance
using 1.5 ×1021 protons on target
Phys. Rev. D Vol. 96, 011102 (2017)
A-098
Abe, K. et al.
Search for nucleon decay into charged
antilepton plus meson in 0.316 megaton ·years exposure of the Super-Kamiokande
water Cherenkov detector
Phys. Rev. D Vol. 96, 012003 (2017)

oscillations by the T2K experiment including
a new additional sample of νe interactions at
the far detector
Phys. Rev. D Vol. 96, 092006 (2017)
A-101
Abe, K. et al.
Combined Analysis of Neutrino andAntineutrino Oscillations at T2K
Phys. Rev. Lett. Vol. 118, 151801 (2017)
A-102
Matsuura,K. et al.
Spin-Orbital Correlated Dynamics in theSpinel-Type Vanadium Oxide MnV2O4
Phys. Rev. Lett., Vol. 119, 017201 (2017)
A-103
Matsumoto, T. et al.
Quantum twin spectra in nanocrystalline
siliconPhys. Rev. Materials, Vol. 1, 051601 (2017)
A-104
Hotchi, H. et al.
Achievement of a low-loss 1-MW beam
operation in the 3-GeV rapid cycling
synchrotron of the Japan Proton Accelerator
Research Complex
Physical Review Accelerators and Beams(Internet), 20(6), p. 060402_1-060402_25(2017)
A-105
Shobuda, Y. et al.
Chromaticity effects on head-tail instabilities
for broadband impedance using two particle
model, Vlasov analysis, and simulations
Physical Review Accelerators and Beams(Internet), 20(7), p. 071003_1-071003_18(2017)
A-106
Ibuka, S. et al.
Damped spin-wave excitations in theitinerant antiferromagnet γ -Fe0.7Mn0.3
Physical Review B, Vol. 95, 224406 (2017)
A-107
Iimura, S. et al.
Large-moment antiferromagnetic orderin overdoped high-Tc superconductor
154SmFeAsO1-xDx
Proc Natl Acad Sci U. S. A., Vol. 114,
E4354-E4359 (2017)

A-099
Abe, K. et al.
Measurement of νμ and νμ charged current
inclusive cross sections and their ratio with
the T2K off-axis near detector
Phys. Rev. D Vol. 96, 052001 (2017)

A-108
Shobuda, Y. et al.
Theoretical elucidation of space charge
effects on the coupled-bunch instability at
the 3 GeV rapid cycling synchrotron at theJapan Proton Accelerator Research Complex
Prog. Theor. Exp. Phys. 2017, 013G01 (2017)

A-100
Abe, K. et al.
Measurement of neutrino and antineutrino

A-109
Ahn, J. K. et al.
A new search for the KL → π0 νν and KL → π0

Publications

J-PARC Annual Report 201784
X0 decays
Prog. Theor. Exp. Phys. 2017, 021C01 (2017)
A-110
Fukuda, T. et al.
First neutrino event detection with nuclear
emulsion at J-PARC neutrino beamline
Prog. Theor. Exp. Phys. 2017, 063C02 (2017)
A-111
Yamada, K. et al.
First demonstration of an emulsion multistage shifter for accelerator neutrino
experiments in J-PARC T60
Prog. Theor. Exp. Phys. 2017, 063H02 (2017)
A-112
Yamamoto, M. et al.
Observation of simultaneous oscillations ofbunch shape and position caused by oddharmonic beam loading in the Japan Proton
Accelerator Research Complex Rapid Cycling
Synchrotron
Prog. Theor. Exp. Phys. 2017, 113G01 (2017)
A-113
Natori, H. et al.
A fast high-voltage switching multiwire
proportional chamber
Prog. Theor. Exp. Phys., Issue2, 023C01 (2017)
A-114
Shobuda, Y. et al.
Theoretical elucidation of space charge
effects on the coupled-bunch instability at
the 3 GeV Rapid Cycling Synchrotron at theJapan Proton Accelerator Research Complex
Prog. Theor. Exp. Phys. (Internet), 2017(1),p. 013G01_1-013G01_39 (2017)
A-115
Harada, H. et al.
Beam-based compensation of extractedbeam displacement caused by field ringing
of pulsed kicker magnets in the 3 GeV rapid
cycling synchrotron of the Japan Proton
Accelerator Research Complex
Prog. Theor. Exp. Phys. (Internet), 2017(9),p. 093G01_1-093G01_16 (2017)

A-116
Shobuda, Y. et al.

Resistive-wall impedances of a thin nonevaporable getter coating on a conductive
chamber
Prog. Theor. Exp. Phys. (Internet), 2017(12),p. 123G01_1-123G01_22 (2017)
A-117
Takada, H. et al.
Materials and Life Science Experimental
Facility at the Japan Proton Accelerator
Research Complex I: Pulsed Spallation
Neutron Source
Quantum Beam Sci., 2017, 1, 8 pp 1-26 (2017)
A-118
Higemoto, W. et al.
Materials and Life Science Experimental
Facility at the Japan Proton Accelerator
Research Complex IV: The Muon Facility
Quantum Beam Sci., Vol. 1, 11 (1-24) (2017)
A-119
Nakamura, S. X. et al.
Towards a unified model of neutrinonucleus reactions for neutrino oscillation
experiments
Rep. Prog. Phys. Vol. 80, 056301 (2017)
A-120
Inutsuka, M. et al.
Dynamic contact angle on a reconstructive
polymer surface by segregation
RSC Adv., Vol. 7, 17202-17207 (2017)
A-121
Cereser, A. et al.
Time-of-Flight Three Dimensional Neutron
Diffraction in Transmission Mode for
Mapping Crystal Grain Structures
Sci. Rep., Vol. 7, 9561 (2017)
A-122
Harjo, S. et al.
Martensite phase stress and thestrengthening mechanism in TRIP steel byneutron diffraction
Sci. Rep., Vol. 7, 15149 (2017)
A-123
Mamiya, H. et al.
Magnetic Bragg dip and Bragg edge inneutron transmission spectra of typical spin
superstructures

Sci. Rep., Vol. 7, 15516 (2017)
A-124
Tremsin, A.S. et al.
Non-Destructive Study of Bulk Crystallinity
and Elemental Composition of Natural Gold
Single Crystal Samples by Energy-Resolved
Neutron Imaging
Sci. Rep., Vol7, 40759 (2017)
A-125
Takagi, S. et al.
Formation of novel transition metal
hydride complexes with ninefold hydrogencoordination
Sci. Rep., Vol. 7, 44253 (2017)
A-126
Tomota, Y. et al.
Reverse austenite transformation behavior
in a tempered martensite low-alloy steel
studied using in situ neutron diffraction
Scripta Materialia, Vol. 133, 79-82 (2017)
A-127
Wang, Y. et al.
Multi-scaled heterogeneous deformation
behavior of pearlite steel studied by in situ
neutron diffraction
Scripta Materialia, Vol140, 45-49 (2017)
A-128
Mashita, R. et al.
Quasielastic Neutron Scattering Study ofMicroscopic Dynamics in Polybutadiene
Reinforced with an Unsaturated Carboxylate
Soft Matter, Vol. 13, 7862-7869 (2017)
A-129
Mori, K. et al.
Structural origin of massive improvementin Li-ion conductivity on transition from
(Li2S)5(GeS2)(P2S5) glass to Li10GeP2S12 crystal
Solid State Ionics, Vol. 301, 163-169 (2017)
A-130
Shishido, H.
Neutron detection using thesuperconducting Nb-based current-biased
kinetic inductance detector
SUPERCONDUCTOR SCIENCE & TECHNOLOGY,
Vol. 30, 094003 (2017)(C) Conference Reports and Books
C-001
Yamazaki, Y.et al.
Current status of J-PARC accelerator
infrastructure
Accelerator Reliability Workshop, ARW 2017
C-002
Ueno, A. et al.

Emittance improvements of cesiatedRF-driven H- ion source to enable 60mA
operation of high-energy and high-intensity
LINACs by plasma impurity controls
AIP Conference Proceedings 1869, p.030011_1030011_10 (2017)C-003
Shibata, T. et al.
High density plasma calculation of J-PARC RF
negative ion source
AIP Conference Proceedings 1869, p.030017_1030017_11 (2017)

J-PARC Annual Report 2017

Publications

85
C-004
Ueno, A. et al.
Transverse RMS emittance evaluation based
upon explicit and reasonable definitions of
100% and 95% beams
AIP Conference Proceedings 1869,
p. 030052_1-030052_7 (2017)
C-005
Oguri, H. et al.
Operation Status of the J-PARC RF-Driven
H- Ion Source
AIP Conference Proceedings, Vol 1869, 030053(2017)
C-006
Seto, H. et al.
Inelastic and quasi-elastic neutron scattering
spectrometers in J-PARC
Biochimica et Biophysica Acta-General
Subjects, Vol. 1861, 3651-3660 (2017)
C-007
Kumano, S.
Hadron tomography studies by generalized
parton distributions and distribution
amplitudes
EPJ Web Conf. Vol. 141, 06002 (2017)
C-008
Nakao, T. et al.
Developments of a new data acquisition
system at ANNRIEPJ Web Conf,Vol.146,03021 (2017)
C-009
Harada, H. et al.
Research and development for accuracy
improvement of neutron nuclear data on
minor actinides
EPJ Web Conf, Vol. 146, 11001 (2017)
C-010
Kino, K. et al.
Measurement of the neutron capture
resonances for platinum using the Ge
spectrometer and pulsed neutron beam at
the J-PARC/MLF/ANNRIEPJ Web Conf, Vol. 146, 11024 (2017)
C-011
Kimura, A. et al.
Neutron capture cross section
measurements of 120Sn, 122Sn and 124Sn
with the array of Ge spectrometer at the
J-PARC/MLF/ANNRIEPJ Web Conf, Vol. 146, 11031 (2017)
C-012
Katabuchi, T. et al.
Measurement of the neutron capture crosssection of 99Tc using ANNRI at J-PARC
EPJ Web Conf, Vol. 146, 11050 (2017)
C-013
Muto, R. et al.
Monitoring System for the Gold Target by

Radiation Detectors in Hadron Experimental
Facility at J-PARC
EPJ Web Conf. Vol. 153, 07004 (2017)C-014
Muto, R. et al.
Monitoring System for the Gold Target by
Radiation Detectors in Hadron Experimental
Facility at J-PARC
EPJ Web Conf. Vol. 153, 07004 (2017)
C-015
Yamamoto,K.
Worker dose under high-power operation of
the J-PARC 3 GeV Rapid Cycling Synchrotron
EPJ Web of Conferences (Internet), 153,
p. 07022_1-07022_6 (2017)
C-016
Ueno, Y. et al.
New precise measurement of muonium
hyperfine structure interval at J-PARC
Hyperfine Interactions, Vol. 238, 14 (2017)
C-017
Kawabata, Y. et al.
Effect of interlamellar interactions on shear
induced multilamellar vesicle formation
J. Chem. Phys., Vol. 147, 034905 (2017)
C-018
Yamamoto, K.
Supersymmetry and Kaon physics
J. Phys. Conf. Ser. Vol. 800, 012013 (2017)
C-019
Shiomi, K.
Status of the J-PARC KOTO experiment
J. Phys. Conf. Ser. Vol. 800, 012022 (2017)
C-020
Asano, S. et al.
Ce-substitution effects on the spin excitation
spectra in Pr1.4-xLa0.6CexCuO4+δ
J. Phys.: Conf. Ser., Vol. 807, 52009 (2017)
C-021
Kamazawa, K. et al.
Possible low spin state of Fe ions in
HoBaFe4O7
J. Phys.: Conf. Ser., Vol. 828, 012012 (2017)
C-022
Haku, T. et al.
Neutron Scattering Study in Breathing
Pyrochlore Antiferromagnet Ba3Yb2Zn5O11
J. Phys.: Conf. Ser., Vol. 828, 012018 (5 pages)(2017)
C-023
Wan, T. et al.
Study on the evaluation of erosion damage
by using laser ultrasonic integrated with awavelet analysis technique
J. Phys.: Conf. Ser., 842(1), p. 012010_1012010_10 (2017)

C-024
Hiroi, K. et al.
Magnetic field imaging of a model electricmotor using polarized pulsed neutrons at
J-PARC/MLF
J. Phys.: Conf. Ser., Vol. 862, 012008 (2017)
C-025
Maruyama, R. et al.
Accessible length scale of the in-planestructure in polarized neutron off-specularand grazing-incidence small-angle scattering
measurements
J. Phys.: Conf. Ser., Vol. 862, 012017 (2017)
C-026
Shinohara, T. et al.
Polarization analysis for magnetic fieldimaging at RADEN in J-PARC/MLF
J. Phys.: Conf. Ser., Vol. 862, 012025 (2017)
C-027
Ibuka, S. et al.
Spin wave dispersion just above themagnetic order-order transition in themetallic antiferromagnet Mn3Pt
J. Phys.: Conf. Ser., Vol. 868, 012017 (2017)
C-028
Otani, M. et al.
Crossbar H-mode drift-tube linac design
with alternative phase focusing for muonlinac
J. Phys. Conf. Ser. Vol. 874, 012038 (2017)
C-029
Kondo, Y. et al.
Beam dynamics design of the muon linac
high-beta section
J. Phys. Conf. Ser. Vol. 874, 012054 (2017)
C-030
Kitamura, R. et al.
First trial of the muon acceleration for J-PARC
muon g-2/EDM experiment
J. Phys. Conf. Ser. Vol. 874, 012055 (2017)
C-031
Yee-Rendon, B. et al.
Electron cloud simulations for the main ringof J-PARC
J. Phys. Conf. Ser. Vol. 874, 012065 (2017)
C-032
Miura, A. et al.
Bunch shape monitor development in
J-PARC linac
J. Phys. Conf. Ser. Vol. 874, 012080 (2017)
C-033
Satou, K. et al.
Development of wide dynamic range beamloss monitor system for J-PARC main ring
J. Phys. Conf. Ser. Vol. 874, 012087 (2017)
C-034
Friend, M.

Publications

J-PARC Annual Report 2017

86
J-PARC accelerator and neutrino beamline
upgrade programme
J. Phys. Conf. Ser. Vol. 888, 012042 (2017)
C-035
Bronner, C. et al.
Physics sensitivity of a possible extended
T2K run–T2K Phase 2
J. Phys. Conf. Ser. Vol. 888, 012215 (2017)
C-036
Ohira-Kawamura, S. et al.
Sample environment at the J-PARC MLF
Journal of Neutron Research, Vol. 19, 15-22(2017)
C-037
Morishita, T. et al.
Vacuum properties and operation stability of
the radio-frequency quadrupole accelerator
in Japan Proton Accelerator ResearchComplex linac
Journal of Vacuum Science & Technology A 35,
041602 (2017)
C-038
Ichikawa, Y. et al.
Study of the K-nucleus interaction by using
the 12C(K-, p) reaction at J-PARC
JPS Conference Proceedings (Internet), 13,
p.020007_1-020007_5 (2017)
C-039
Tamura,H. et al.
γ-ray spectroscopy of hypernuclei; Recent
results and prospect at J-PARC
JPS Conference Proceedings (Internet), 17,
p.011004_1-011004_11 (2017)
C-040
Yang, S.B. et al.
The First gamma-ray spectroscopic study of19
sd-shell hypernucleus, Λ F
JPS Conference Proceedings (Internet), 17,
p.012004_1-012004_4 (2017)
C-041
Nakagawa, M. et al.
Search for excited state of Σ hypernucleus in
the J-PARC E13 experiment
JPS Conference Proceedings (Internet), 17,
p.012009_1-012009_4 (2017)
C-042
Miwa, K. et al.
High statistics Σ p scattering experimentusing high intensity pion beams at J-PARC
JPS Conference Proceedings (Internet), 17,
p.041002_1-041002_6 (2017)
C-043
Sako, H.
Study of baryon excited states in (π,2π)
reactions at J-PARC
JPS Conference Proceedings (Internet), 17,
p.063004_1-063004_2 (2017)

C-044
Gogami, T. et al.
Spectroscopy of nuclei with multistrangeness by using new S-2S spectrometer
at J-PARCJPS Conference Proceedings (Internet), 18,
p.011031_1-011031_6 (2017)
C-045
Sasa, T. et al.
Design of 250kW LBE spallation target for
the Japan Proton Accelerator ResearchComplex (J-PARC)
NEA/CSNI/R(2017)2 (Internet), p. 111-116(2017)
C-046
Wan, T. et al.
Study on optimisation of target head designfor the TEF-T LBE spallation target
NEA/CSNI/R(2017)2 (Internet), p. 117-127(2017)
C-047
Obayashi, H. et al.
Application of ultrasonic flowmeter for LBE
flow
NEA/CSNI/R(2017)2 (Internet), p. 188-194(2017)
C-048
Saito, S. et al.
Status of LBE corrosion test loop "OLLOCHI"
and experiments at JAEA
NEA/CSNI/R (2017)2 (Internet), p. 195-200(2017)
C-049
Oikawa, K. et al.
A comparative study of the crystallite size
and the dislocation density of bent steel
plates using Bragg-edge transmission
imaging, TOF neutron diffraction and EBSD
Phys. Procedia, Vol. 88, 34-41 (2017)
C-050
Su, Y. H. et al.
Time-of-flight Neutron Transmission Imagingof Martensite Transformation in Bent Platesof a Fe-25Ni-0.4C Alloy
Phys. Procedia, Vol. 88, 42-49 (2017)
C-051
Kamiyama, T. et al.
Microstructural Information Mapping of a
Plastic-deformed α-iron Plate during Tensile
Tests using Pulsed Neutron Transmission
Phys. Procedia, Vol. 88, 50-57 (2017)
C-052
Ito, D. et al.
Visualization of solidification process in leadbismuth eutectic
Phys. Procedia, Vol. 88, 58-63 (2017)
C-053
Matsumoto, Y. et al.

Recent progress of radiography andtomography at the energy-resolved neutron
imaging system RADEN
Phys. Procedia, Vol. 88, 162-166 (2017)
C-054
Seki, Y. et al.
Experimental evaluation of neutron
absorption grating fabricated by obliqueevaporation of gadolinium for phaseimagingPhys. Procedia, Vol. 88, 217-223 (2017)
C-055
Hayashida, H. et al.
Development of an in-situ SEOP 3He neutron
spin filter for magnetic imaging techniques
Phys. Procedia, Vol. 88, 231-236 (2017)
C-056
Kai, T. et al.
Reliability estimation of neutron resonancethermometry using tantalum and tungsten
Phys. Procedia, Vol. 88, 306-313 (2017)
C-057
Nakane, Y. et al.
Dose Measurements through the Concreteand Iron Shields under the 100 to 400 MeV
Quasi-Monoenergetic Neutron Field (atRCNP, Osaka Univ.)
Proc. of 13th International Conference on
Radiation Shielding & 19th Topical Meetingof the Radiation Protection and Shielding
Division of the American Nuclear Society-2016,
EPJ Web of Conference 153, 08022 (2017)
C-058
Hotchi, H. et al.
Recent progress of J-PARC RCS beamcommissioning; Efforts for realizing a highintensity low-emittance beamProc. of 14th Annual Meeting of Particle
Accelerator Society of Japan (Internet),
p. 95-99 (2017)
C-059
Tamura, F. et al.
Development of a vector rf voltage control
system for the J-PARC RCS
Proc. of 14th Annual Meeting of Particle
Accelerator Society of Japan (Internet),
p. 241-245 (2017)
C-060
Yamamoto, K. et al.
New injection system design of the J-PARC
rapid cycling synchrotron
Proc. of 14th Annual Meeting of Particle
Accelerator Society of Japan (Internet), p.374378 (2017)
C-061
Kondo, Y. et al.
High-beta section of a muon linac for themeasurement of the muon g-2/EDM at
J-PARCJ-PARC Annual Report 2017

Publications

87
Proc. of 14th Annual Meeting of Particle
Accelerator Society of Japan (Internet), 398400 (2017)
C-062
Hayashi, N. et al.
Interlocked events of beam loss monitors at
the J-PARC linac
Proc. of 14th Annual Meeting of Particle
Accelerator Society of Japan (Internet),
p. 540-544 (2017)
C-063
Sako, H. et al.
Observation of beam loss proton tracks at
400 MeV J-PARC Linac
Proc. of 14th Annual Meeting of Particle
Accelerator Society of Japan (Internet),
p. 545-547 (2017)
C-064
Shinto, K. et al.
Effect of RF discharge for a high intnsity Hion source on the eztracted beamProc. of 14th Annual Meeting of Particle
Accelerator Society of Japan (internet), 648650 (2017)

Accelerator Society of Japan (Internet),p. 866-870 (2017)
C-070
Suganuma, K. et al.
Present status of water cooling system at
J-PARC LINAC 2017
Proc. of 14th Annual Meeting of Particle
Accelerator Society of Japan (Internet),
p. 871-873 (2017)
C-071
Fujirai, K. et al.
Vibration analysis of water cooling towers'
defective fan bearing units at J-PARC RCS
Proc. of 14th Annual Meeting of Particle
Accelerator Society of Japan (Internet),
p. 874-876 (2017)
C-072
Sawabe, Y. et al.
Improvement of a timing system in J-PARC
Linac/RCS
Proc. of 14th Annual Meeting of Particle
Accelerator Society of Japan (Internet),
p. 1133-1136 (2017)

C-065
Ohkoshi, K. et al.
Operation Status of the J-PARC H- Ion Source
Proc. of 14th Annual Meeting of Particle
Accelerator Society of Japan (Internet), 651654 (2017)

C-073
Takahashi, H. et al.
Supervision and alarm system for J-PARC
Linac and RCS
Proc. of 14th Annual Meeting of Particle
Accelerator Society of Japan (Internet),
p. 1151-1154 (2017)

C-066
Harada, H. et al.
Laser storage ring with high power for
realization of laser stripping injection
Proc. of 14th Annual Meeting of Particle
Accelerator Society of Japan (Internet),
p. 684-688 (2017)

C-074
Morishita, T. et al.
Floor deformation and vibration
measurements of the J-PARC linac
Proc. of 14th Annual Meeting of Particle
Accelerator Society of Japan (Internet), 12871290 (2017)

C-067
Hirano, K. et al.
Negative hydrogen ion beam irradiation
experiments of beam scrapers using the
J-PARC 3MeV-linac
Proc. of 14th Annual Meeting of Particle
Accelerator Society of Japan (Internet), 847852 (2017)

C-075
Hasegawa, K. et al.
Status of J-PARC accelerators
Proc. of 14th Annual Meeting of Particle
Accelerator Society of Japan (Internet),
p. 1317-1321 (2017)

C-068
Okabe, K. et al.
A Failure investigation of the beamcollimator system in the J-PARC 3 GeV rapid
cycling synchrotron
Proc. of 14th Annual Meeting of Particle
Accelerator Society of Japan (Internet),
p. 853-857 (2017)
C-069
Saha, P. K. et al.
Status of proof-of-principle experiment for
400 MeV H- stripping to protons by using
only lasers in the 3-GeV RCS of J-PARC
Proc. of 14th Annual Meeting of Particle

C-076
Obayashi, H. et al.
Experimental application of ultrasonicflowmeter for TEF-T LBE spallation target
system
Proc. of 17th International Topical Meetingon Nuclear Reactor Thermal Hydraulics(NURETH-17) (USB Flash Drive), 10 Pages(2017)
C-077
Wan, T. et al.
Study on the thermal-hydraulic of TEF-T LBE
spallation target in JAEA
Proc. of 17th International Topical Meetingon Nuclear Reactor Thermal Hydraulics(NURETH-17) (USB Flash Drive),13pages (2017)

C-078
Shibata, T. et al.
LEBT commissioning of the J-PARC LINAC
Proc. of 28th International Linear Accelerator
Conference (LINAC 2016) (Internet), p. 251-253(2017)
C-079
Artikova, S. et al.
Deflector design for spin rotator in muon
linear accelerator
Proc. of 28th International Linear Accelerator
Conference (LINAC 2016) (Internet), p. 830-832(2017)
C-080
Hayashi, N. et al.
Beam-loss monitoring signals of interlocked
events at the J-PARC Linac
Proc. of 5th International Beam
Instrumentation Conference (IBIC 2016)(Internet), p. 368-371 (2017)
C-081
Takei, H. et al.
Present status of the laser charge exchange
test using the 3-MeV linac in J-PARC
Proc. of 5th International Beam
Instrumentation Conference (IBIC 2016)(Internet), p. 736-739 (2017)
C-082
Hayashi, N. et al.
Beam position measurement during multiturn painting injection at the J-PARC RCS
Proc. of 8th International Particle Accelerator
Conference (IPAC '17) (Internet), p. 277-280(2017)C-083
Yamamoto,K. et al.
New injection scheme of J-PARC rapid
cycling synchrotron
Proc. of 8th International Particle Accelerator
Conference (IPAC '17) (Internet), p. 579-581(2017)
C-084
Hasegawa, K. et al.
Performance and status of the J-PARC
accelerators
Proc. of 8th International Particle Accelerator
Conference (IPAC '17) (Internet), p. 2290-2293(2017)
C-085
Tamura, J. et al.
Detection of H0 Particles in MEBT2 Chicaneof J-PARC Linac
Proc. of 8th International Particle Accelerator
Conference (IPAC '17) (Internet), p. 2308-2310(2017)
C-086
Hotchi, H. et al.
Realizing a high-intensity low-emittancebeam in the J-PARC 3-GeV RCSPublications

J-PARC Annual Report 201788
Proc. of 8th International Particle Accelerator
Conference (IPAC '17) (Internet), p. 2470-2473(2017)
C-087
Saha, P. K. et al.
Simulation studies of transverse beam
instabilities and measures beyond 1 MW
beam power in the 3-GeV RCS of J-PARC
Proc. of 8th International Particle Accelerator
Conference (IPAC '17) (Internet), p. 3750-3752(2017)
C-088
Takahashi, H. et al.
Stabilization of timing system operation of
J-PARC Linac and RCS
Proc. of 8th International Particle Accelerator
Conference (IPAC '17) (Internet), p. 4000-4002(2017)
C-089
Ito, T. et al.
Multipactor Problem of J-PARC SDTL
Proc. of 8th International Particle Accelerator
Conference (IPAC '17) (Internet), p. 4184-4186(2017)
C-090
Naganawa, N. et al.
A neutron detector with submicron spatial
resolution using fine- grained nuclear
emulsion
Proc. of 8th International Topical Meeting on
Neutron Radiography, ITMNR-8, 4-8 September
2016, Beijing, China, Physics Procedia, Vol. 88,
224-230 (2017)
C-091
S. Meigo, H. Matsuda, H. Iwamoto
Cross section measurement in J-PARC forneutronics of the ADS
Proc. of AccApp'17 pp. 396-402 (2017)
C-092
Sugiyama, Y. et al.
MEASUREMENT OF THE LONGITUDINAL
COUPLED BUNCH INSTABILITIES IN THE
J-PARC MAIN RING
Proc. of IBIC2017, Grand Rapids, USA
p. 225 (2017)
C-093
Kobayashi, A. et al.
UPGRADE OF THE BEAM POSITIONMONITORING SYSTEM AT THE J-PARC MAIN
RING FOR HIGH INTENSITY OPERATION
Proc. of IBIC2017, Grand Rapids, USA p. 229(2017)
C-094
Toyama, T. et al.
NEW DESIGN OF A TAPERED-COUPLER BPM
TOWARD SIMPLER GEOMETRY AND FLATTERFREQUENCY RESPONSE
Proc. of IBIC2017, Grand Rapids, USA p. 237(2017)

C-095
Agari, K. et al.
DEVELOPMENT OF THE POWER SUPPLYCONTROL SYSTEM FOR J-PARC HADRONEXPERIMENTAL FACILITY
Proc. of ICALEPCS2017, Barcelona, Spainp. 697 (2017)

C-104
Satou, K. et al.
DEVELOPMENT OF WIDE DYNAMIC RANGEBEAM LOSS MONITOR SYSTEM FOR J-PARC
MAIN RING
Proc. of IPAC2017, Copenhagen, Denmarkp. 1248 (2017)

C-096
Kimura, T. et al.
OPERATION STATUS OF J-PARC MR MACHINEPROTECTION SYSTEM AND FUTURE PLAN
Proc. of ICALEPCS2017, Barcelona, Spainp. 341 (2017)

C-105
Hasegawa, K. et al.
PERFORMANCE AND STATUS OF THE J-PARC
ACCELERATORS
Proc. of IPAC2017, Copenhagen, Denmarkp. 2290 (2017)

C-097
Nakayoshi, K. et al.
DEVELOPMENT OF AN EXPERT SYSTEMFOR THE HIGH INTENSITY NEUTRINO BEAM
FACILITY AT J-PARC
Proc. of ICALEPCS2017, Barcelona, Spainp. 1229 (2017)

C-106
Ohmori, C. et al.
BATCH COMPRESSION FOR MULTI-MW
J-PARC
Proc. of IPAC2017, Copenhagen, Denmarkp. 2294 (2017)

C-098
Moriyama, K. et al.
DEVELOPMENT OF STATUS ANALYSISSYSTEM BASED ON ELK STACK AT J-PARC
MLF
Proc. of ICALEPCS2017, Barcelona, Spainp. 1423 (2017)
C-099
Kamikubota, N. et al.
NETWORK SYSTEM OPERATION FOR J-PARC
ACCELERATORS
Proc. of ICALEPCS2017, Barcelona, Spainp. 1470 (2017)
C-100
Miura, A. et al.
BUNCH SHAPE MONITOR DEVELOPMENT IN
J-PARC LINAC
Proc. of IPAC2017, Copenhagen, Denmarkp. 271 (2017)
C-101
Toyama, T. et al.
MEASUREMENT OF TRANSVERSE MULTIPOLE
MOMENTS OF THE PROTON BEAM IN THE
J-PARC MR
Proc. of IPAC2017, Copenhagen, Denmarkp. 274 (2017)
C-102
Shibata, T. et al.
THE DEVELOPMENT OF A NEW LOW FIELDSEPTUM MAGNET SYSTEM FOR FASTEXTRACTION IN MAIN RING OF J-PARC
Proc. of IPAC2017, Copenhagen, Denmarkp. 573 (2017)
C-103
Shibata, T. et al.
THE NEW HIGH FIELD INJECTION SEPTUM
MAGNET SYSTEM FOR MAIN RING OF J-PARC
Proc. of IPAC2017, Copenhagen, Denmarkp. 576 (2017)

C-107
Yamamoto, M. et al.
AN UPGRADE SCENARIO OF RF SYSTEM TO
ACHIEVE 1.6 MW BEAM ACCELERATION IN
J-PARC RCS
Proc. of IPAC2017, Copenhagen, Denmarkp. 2297 (2017)
C-108
Kondo, Y. et al.
BEAM DYNAMICS DESIGN OF THE MUON
LINAC HIGH-BETA SECTION
Proc. of IPAC2017, Copenhagen, Denmarkp. 2304 (2017)
C-109
Tamura, J. et al.
DETECTION OF H0 PARTICLES IN MEBT2CHICANE OF J-PARC LINAC
Proc. of IPAC2017, Copenhagen, Denmarkp. 2308 (2017)
C-110
Kitamura, R. et al.
FIRST TRIAL OF THE MUON ACCELERATIONFOR J-PARC MUON g-2/EDM EXPERIMENT
Proc. of IPAC2017, Copenhagen, Denmarkp. 2311 (2017)
C-111
Otani, M. et al.
CROSSBAR H-MODE DRIFT-TUBE LINACDESIGN WITH ALTERNATIVE PHASE
FOCUSING FOR MUON LINAC
Proc. of IPAC2017, Copenhagen, Denmarkp. 2868 (2017)
C-112
Shobuda, Y. et al.
COUPLED BUNCH INSTABILITY AND ITS CURE
AT J-PARC RCS
Proc. of IPAC2017, Copenhagen, Denmarkp. 2946 (2017)

J-PARC Annual Report 2017

Publications

89
C-113
Ito, T. et al.
MULTIPACTOR PROBLEM OF J-PARC SDTL
Proc. of IPAC2017, Copenhagen, Denmarkp. 4184 (2017)

C-123
Nishiguchi, H.
Search for Muon-to-Electron Conversion at
J-PARC: COMET ExperimentProc. of Science, EPS-HEP 2017, 674 (2017)

C-114
Yee-Rendon, B. et al.
ELECTRON CLOUD SIMULATIONS FOR THE
MAIN RING OF J-PARC
Proc. of IPAC2017, Copenhagen, Denmarkp. 4436 (2017)

C-124
Chikuma, N. et al.
Development of electronics and dataacquisition system for the J-PARC T59(WAGASCI) experimentProc. of Science, EPS-HEP 2017, 780 (2017)

C-115
Artikova, S. et al.
BEAM DYNAMICS STUDIES ON LOW AND
MEDIUM ENERGY BEAM TRANSPORT WITH
INTENSE H−IONS FOR J-PARC LINAC
Proc. of IPAC2017, Copenhagen, Denmarkp. 4439 (2017)

C-125
Fujii, Y.
Development of the Diamond based Proton
Beam Monitor for COMET ExperimentProc. of Science, EPS-HEP 2017, 789 (2017)

C-116
Shirakata, M.
ESTIMATION AND MEASUREMENTS OF
RADIATION DOSE DISTIBUTION FOR THE
RADIATION TEST AREA IN J-PARC MAIN RING
Proc. of IPAC2017, Copenhagen, Denmarkp. 4689 (2017)
C-117
Grillenberger, J. K. et al.
THE ENERGY EFFICIENCY OF HIGH INTENSITYPROTON DRIVER CONCEPTS
Proc. of IPAC2017, Copenhagen, Denmarkp. 4842 (2017)
C-118
Sako, H.
Baryon spectroscopy in (π,2π) reactions with
106Hz pion beams at J-PARC
Proc. of Science (Internet), 5 Pages (2017)
C-119
Nagae, T. et al.
Observation of Ξ bound states in the 12C(K-,K+)X reaction at 1.8 GeV/c in J-PARC
Proc. of Science (Internet), 7 Pages (2017)
C-120
Tanaka, K.
Exclusive pion-induced Drell-Yan process at
J-PARC for accessing the nucleon GPDs andsoft nonfactorizable mechanism
Proc. of Science, DIS 2017, 249 (2017)
C-121
Park, J.
Searching for a Sterile Neutrino at J-PARC
MLF: JSNS2 experimentProc. of Science, EPS-HEP 2017, 128 (2017)
C-122
Ueno, K. et al.
Development of a thin-wall straw-tube
tracker for COMET experimentProc. of Science, EPS-HEP 2017, 524 (2017)

C-126
Sato, Y.
Muon g–2/EDM Experiment at J-PARC
Proc. of Science, KMI 2017, 006 (2017)
C-127
Shibata, T. et al.
THE DEVELOPMENT OF NEW INJECTIONSEPTUM MAGNET FOR UPGRATING OF
J-PARC MR(3)Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 68 (2017)
C-128
Shimogawa, T. et al.
FIRST NEW POWER SUPPLY OF MAIN
MAGNET FOR J-PARC MAIN RING UPGRADE
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 73 (2017)
C-129
Soma, T. et al.
PREDICTIVE DETECTION & DIAGNOSIS OF
ACCELERATOR SYSTEM USING SYSTEMINVARIANT ANALYSIS TECHNOLOGY (SIAT)
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japanp. 81 (2017)
C-130
Sato, Y. et al.
BEAM LOSS LOCALIZATION WITH SCATTERERCATCHER SYSTEM IN J-PARC MAIN RING
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 90 (2017)
C-131
Kitamura, R. et al.
CURRENT PREPARATION AND PROSPECTS OF
THE MUON ACCELERATION TEST WITH RFQ
IN J-PARC
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 100 (2017)

C-132
Kobayashi, A. et al.
UPGRADE OF THE BEAM POSITION MONITOR(BPM) AT THE J-PARC MAIN RING FOR HIGHINTENSITY OPERATION
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 187 (2017)
C-133
Yee-Rendon, B. et al.
PYECLOUD SIMULATIONS OF THE ELECTRONCLOUD FOR THE J-PARC MR
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 197 (2017)
C-134
Tamura, F. et al.
DEVELOPMENT OF A VECTOR RF VOLTAGE
CONTROL SYSTEM FOR THE J-PARC RCS
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 241 (2017)
C-135
Otani, M. et al.
DTL DESIGN FOR MUON LINAC
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 364 (2017)
C-136
Kondo, Y. et al.
HIGH-BETA SECTION OF A MUON LINAC FOR
THE MEASUREMENT OF THE MUON G-2/EDM
AT J-PARC
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 398 (2017)
C-137
Futatsukawa, K. et al.
STATUS OF THE J-PARC LINAC LLRF SYSTEM
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 486 (2017)
C-138
Fukuoka, S. et al.
DEVELOPMENT OF BUNCH SHAPE MONITOR
AND STUDY OF LONGITUDINAL BEAM
MATCHING AT J-PARC LINAC
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 535 (2017)
C-139
Hayashi, N. et al.
INTERLOCKED EVENTS OF BEAM LOSSMONITORS AT THE J-PARC LINAC
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 540 (2017)
C-140
Sako, H. et al.

Publications

J-PARC Annual Report 201790
OBSERVATION OF BEAM LOSS PROTON
TRACKS AT 400 MEV J-PARC LINAC
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 545 (2017)
C-141
Miura, A. et al.
TENSILE FRACTURE TEST OF METRIC WIRE OF
BEAM PROFILE MONITORS
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 560 (2017)
C-142
Miyao, T. et al.
BEAM PROFILE MEASUREMENT USINGCARBON NANOTUBE WIRES
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 572 (2017)
C-143
Sato, K. et al.
DEVELOPMENT OF TRIGGERED SCALER TO
DETECT MISSING TRIGGER
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 627 (2017)
C-144
Shinto, K. et al.
EFFECT DUE TO RF DISCHARGE FROM A
HIGH INTENSITY H−ION SOURCE UPON THE
EXTRACTED BEAM
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 648 (2017)
C-145
Ohkoshi, K. et al.
OPERATION STATUS OF THE J-PARC H- ION
SOURCE
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 651 (2017)
C-146
Watanabe, H. et al.
DEVELOPMENT OF A RADIATION-RESISTANTROTATION SENSOR FOR NEW PRODUCTIONTARGET AT J-PARC HADRON FACILITY
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 655 (2017)
C-147
Takahashi, H. et al.
DEVELOPMENT OF NEW PRODUCTIONTARGET AT J-PARC HADRON EXPERIMENTAL
FACILITY
Proc.of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 660 (2017)
C-148
Wakai, E. et al.

IMPORTANCE AND INTERNATIONALCOLLABORATION OF RADIATION DAMAGERESEARCH IN ACCELERATOR-TARGET FIELD
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 724 (2017)
C-149
Hirano, K. et al.
NEGATIVE HYDROGEN ION BEAM
IRRADIATION EXPERIMENTS OF BEAMSCRAPERS USING THE J-PARC 3MEV-LINAC
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 847 (2017)
C-150
Ohmori, C. et al.
A BUNCH MANIPULATION FOR MULTI-MW
J-PARC
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 858 (2017)
C-151
Saha, P. K. et al.
STATUS OF PROOF-OF-PRINCIPLE
EXPERIMENT FOR 400 MeV H- STRIPPING TO
PROTONS BY USING ONLY LASERS IN THE
3-GeV RCS OF J-PARC
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japanp. 866 (2017)
C-152
Niki, K. et al.
OPERATION STATUS AND RADIATIONRESISTANT PERFORMANCE OFSURVEILLANCE CAMERA IN J-PARC MR
TUNNEL
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 882 (2017)
C-153
Liu, Y. et al.
PROGRESSES OF J-PARC LINAC
COMMISSIONING
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 885 (2017)
C-154
Igarashi, S. et al.
TRANSVERSE RESONANCES AND
CORRECTIONS IN
J-PARC MR
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 889 (2017)
C-155
Muto, R. et al.
SIMULATION STUDY OF BEAM SCATTERER
FOR BEAM LOSS MITIGATION IN SLOWEXTRACTION AT J-PARC MR
Proc. of the 14th Annual Meeting of Particle

Accelerator Society of Japan, Sapporo, Japanp. 892 (2017)
C-156
Hasegawa, K. et al.
STATUS REPORT OF THE RF CAVITY WITH
FT3L MA CORES AND DEVELOPMENT OF A
VACUUM CAPACITOR
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 924 (2017)
C-157
Agari, K. et al.
DEVELOPMENT OF CURRENT MONITORINGSYSTEM FOR MAGNET POWER SUPPLY AT
J-PARC HADRON EXPERIMENTAL FACILITY
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 1040 (2017)
C-158
Miura, K. et al.
DEVELOPMENT OF COMPACT POWER
SUPPLY FOR CAPACITOR BANK CONTROLTEST AT J-PARC MR
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 1043 (2017)
C-159
Hirose, E. et al.
INSTALLATION OF A GIANT SPECTROMETERMAGNET WITH A WEIGHT OF 300 TONS AT
J-PARC HADRON EXPERIMENTAL FACILITY
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 1046 (2017)
C-160
Hirose, E. et al.
INSTALLATION OF A GIANT SPECTROMETERMAGNET WITH A WEIGHT OF 300 TONS AT
J-PARC HADRON EXPERIMENTAL FACILITY
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 1046 (2017)
C-161
Shibata, T. et al.
THE DEVELOPMENT OF A NEW FASTEXTRACTION SEPTUM MAGNET FOR
UPGRADING OF J-PARC MR
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 1051 (2017)
C-162
Morita, Y. et al.
DEVELOPMENT OF CAPACITOR BANK OF
J-PARC MR MAIN MAGNET POWER SUPPLYFOR HIGH REPETITION RATE OPERATION
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 1056 (2017)

J-PARC Annual Report 2017

Publications

91
C-163
Sugimoto, T. et al.
UPGRADE OF THE COMPENSATION KICKERMAGNET FOR J-PARC MAIN RING
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 1061 (2017)
C-164
Naito, D. et al.
EVALUATION OF MULTIPOLE MAGNETIC
FIELD WITH HIGH REPETITION RATEOPERATION IN J-PARC MR
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 1065 (2017)
C-165
Yee-Rendon, B. et al.
MEASUREMENTS OF THE ENERGY
DISTRIBUTION OF THE ELECTRON CLOUD AT
J-PARC MR
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 1069 (2017)
C-166
Sugiyama, Y. et al.
ANALYSIS OF LONGITUDINAL BEAM
OSCILLATION IN J-PARC MR
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 1072 (2017)
C-167
Shirakata, M. et al.
FOUR-AXES BEAM COLLIMATOR AND BEAM
LOSS RESPONSES AT THE J-PARC MR
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 1077 (2017)
C-168
Moriya, K. et al.
DEVELOPMENT OF THE BUNCH SHAPEMONITOR IN THE J-PARC L3BT
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 1081 (2017)
C-169
Futatsukawa, K. et al.
DEVELOPMENT OF BUNCH SHAPE MONITOR
AT MEBT2 OF J-PARC LINAC(D) KEK Reports
D-001
Maruyama, T. et al.
11th KEK summer challenge in 2017
KEK Proceedings 2017-10 (2017)

Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 1084 (2017)
C-170
Kurimoto, Y.
REAL-TIME OPTICS CORRECTIONS USINGPRECISE MEASUREMENT OF THE CURRENT
THROUGH MAIN MAGNETS
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 1089 (2017)
C-171
Toyama, T. et al.
BEAM SIZE MEASUREMENT WITH THE BPMS
IN THE J-PARC 3-50BT
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 1094 (2017)
C-172
Kamikubota, N. et al.
MIGRATION SCENARIO OF WAVEFORM
DIGITIZERS USED IN J-PARC MR
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 1137 (2017)
C-173
Toyoda, A. et al.
DEVELOPMENT OF DATA ARCHIVE SYSTEMFOR J-PARC HADRON BEAMLINE(2)Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 1140 (2017)
C-174
Yamada, S. et al.
DEPLOYMENT OF ARCHIVER APPLIANCE AT
J-PARC MAIN RING
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 1144 (2017)

C-175
Kimura, T. et al.
PERFORMANCE EVALUATION OF MR-MPS
AND DEVELOPMENT PLAN OF NEW MR-MPS
FOR J-PARC
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 1148 (2017)

C-176
Doi, K. et al.
CURRENT STATUS AND FUTURE PROSPECT
OF J-PARC MAIN RING ARCHIVE WEB VIEWER
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 1155 (2017)
C-177
Yanaoka, E. et al.
DEVELOPMENT OF FORCED SYNCHRONOUS
TRIP SYSTEM OF BUMP MAGNET POWER
SUPPLIES
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 1158 (2017)
C-178
Kawabata, Y. et al.
DURABILITY OF POSITIONING SENSOR
NETWORK SYSTEM IN RADIATIONENVIRONMENT (J-PARC) AND APPLICATION
PLAN OF DISASTER PREVENTION APP
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 1282 (2017)
C-179
Hasegawa, K. et al.
STATUS OF J-PARC ACCELERATORS
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
p. 1317 (2017)
C-180
Satou, K. et al.
Development of wide dynamic range beamloss monitor system
for J-PARC main ring
Proc. of the 14th Annual Meeting of Particle
Accelerator Society of Japan, Sapporo, Japan
WEP079 (2017)
C-181
OI, N. et al.
Measurement of neutron scattering fromnoble gas to search for a short-range
unknown force
Proc. of the 26th International Nuclear Physics
Conference, 11-16 September, 2016, Adelaide,
Australia, Proceedings of Science (2017)

Publications

J-PARC Annual Report 2017

92(F) Others
F-001
Harjo, S. et al.
Changes of Dislocation Density and
Dislocation Arrangement during Tensile
Deformation in Lath Martensitic Steels
Advanced Experimental Mechanics, Vol. 2, 112117 (2017)
F-002
Takahashi, H.
Report on Symposiums in the Autumn
Meeting 2016
Butsuri Vol. 72 No. 2, p. 130 (2017)
F-003
Takahashi, H.
Report on Symposiums in the Autumn
Meeting 2016
Butsuri Vol. 72 No. 3, p. 197 (2017)
F-004
Takahashi, H.
Report on Symposium in the 72nd Autumn
Meeting
Butsuri Vol. 72 No. 7, p. 518 (2017)
F-005
Nakamura, T. et al.
Development of Scintillation Neutron
Detector using Wavelength-shifting Fiber
Technology(J) JAEA Reports
J-001
Sugawara, T. et al.
Cladding tube burst experiment assumed
MA fuel pin for transmutation physics
experimental facility
JAEA-Research 2017-011, 35 Pages (2017)

Hamon, Vol. 27(1), p. 4-7 (2017)
F-006
Iizuka, R. et al.
In situ neutron diffraction of iron hydridein iron-silicate-water system under highpressure and high temperature condition
Hamon, Vol. 27(3), p. 104-108 (2017)
F-007
Iinuma, H. et al.
SCCJ Café–Season 5–Molecular Science in
Biology(4)–Novel Quantum Beam, Muon
Spectroscopy and Theoretical Approach–
J. Comput. Chem. Jpn., Vol. 16, A12-A17 (2017)
F-008
Yamamoto, K. et al.
Water Content Near Surface of Poly(dimethyl
siloxane)-<i>co</i>-poly(<i>N</i>,<i>N</
i>-dimetly acrylamide) Hydrogel Revealed
by Neutron Reflectivity Measurements
Japanese journal of polymer science andtechnology, Vol. 74, 36-40 (2017)
F-009
Nakagawa, H. et al.
Basic and applied life science extended byneutron
Journal of the Particle Accelerator Society ofJapan, Vol. 13(4), p. 214-219 (2017)

F-010
Nakajima, K. et al.
Materials and Life Science Experimental
Facility (MLF) at the Japan Proton Accelerator
Research Complex II: Neutron Scattering
Instruments
Quantum Beam Science, Vol. 1, 9 (2017)
F-011
Akita, K. et al.
In-situ Residual Stress Analysis during
Thermal Cycle of a Dissimilar Weld Joint
Using Neutron Diffraction and IEFEM
Quarterly Journal of the Japan Welding
Society, Vol. 35, 112s-116s (2017)
F-012
Nakajima, K.
A Cold-Neutron Disk-Chopper Spectrometer
AMATERAS and Scientific Research Carriedout on This Spectrometer
RADIOISOTOPES, Vol. 66(2), 101-115 (2017)
F-013
Tomota, Y. et al.
Recent Progress of Line-profile Analyses for
Neutron or X-ray Diffraction
Tetsu-to-Hagané,Vol.103,73-85 (2017)